How to Repair the Comfort Control Module (CCM) for the Volkswagen Passat

Wait! My Windows Won’t Go Down!

This was our experience after buying a 1998 VW Passat, cheap. After doing some research we realized that the wires in the Comfort Control Module might be corroded, leading to electrical problems. Our windows didn’t work and neither did some interior lights or the power locks, but our sunroof and other interior lights worked just fine.

(ps – we love that this page has proven so helpful to so many over the last two years, and we have no plans to add google or other ads to make money off of it.  However, our family has just entered into a new phase of life as we pursue moving to Africa to serve there.  Part of this process requires “partnership development” or fund-raising.  If you would like to help us along the way, please visit our “About Us” tab to see how you can do that financially.  Thank you! :) )

Whoever decided to put a major electrical module under the feet of the driver where water might (will!) get to it…well, they weren’t walking on the bright side of the road that day. And VW not changing it in the 7 years they made this model of Passat?! Thus you have a very common problem. There are good how-tos online that explain cleaning the drain holes out that could be causing water to hit the CCM, so if you do find corrosion make sure to clean the holes as well.

There is another website that has a “how to” for this issue with photos on headfuzz. When we tried to find this website before it was down, so that’s why we decided to take lots of photos when we repaired our Passat. After reading this and seeing how doable the repair is, I hope you might be encouraged to fix your own lovable lemon!

What you need

These are the things you might need for your CCM repair: pliers, screwdriver, electrical tape, butt connectors and a sharp knife.

Getting Started

The first thing to do is take the plastic footguard off with your screwdriver.  This is the place your left foot usually rests.

Next you need to pop off the long plastic piece that goes between the metal frame and the footwell fabric.  Lifting the fabric up you will see a bundle of wires attached to a black box. The fabric may be a little hard to lift but it’s doable. To make it easier to pull up you can flip off the clips that hold it down.  Reaching in, grab the black box out and place it on top of the fabric.

Open the box

The snaps may be tight on yours, we had to use the screwdriver to pop ours open.  Once you’ve gotten the box open, take a close look at the wires.

As you can see, once unwrapped there was clearly a problem with the black wires. This is actually one black wire that is connected to four other wires.

If you don’t see any problems at all with your wires then you have two options.  One:  disconnect the wires (harness) from the computer box and check each one with a multimeter.  Two:  open the computer box (printed circuit board or PCB) and look at it to see if it is corroded or burnt out.  If it is, then you’ll probably need to replace the board itself.

Take the corroded wire ends and using your sharp blade, cut around the wire about a 1/2″ away from the end. Peel the 1/2″ of plastic off. You should now have clean wires at the tip, if they are not clean you can use a little reflux to take off the corrosion. Make sure all wire ends on the affected circuit have visible metal ends.

Take a connector butt and put it on one side of the circuit.

In this picture, all four black wires are in the connector already.  Place the other wire end into the connector.  Hold it together carefully and get the pliers.  Place the pliers on the middle of the connector. 

Squeeze tightly on the pliers; what you are doing in essence is binding the wires on each side together in a metal envelope that is covered in plastic.

When you are done squeezing, the connector should look like this. The wires on either end should be firmly connected.  If wires do come out, then you have to do it over again (with a new connector or with the same one after you’ve unbent the metal inside).

Now you can put the keys in the ignition and try using what wasn’t working before. For us, it was the windows. They work! Yay!

Make sure you inspect all of the wires in the CCM and repair any that need it. If the wires are not badly damaged, a little electrical tape around the connection may be all that’s necessary.

Once you’ve repaired all the wires, close the box and replace it under the footwell fabric. Close up the gap between the frame and fabric with the plastic cover again and replace the footguard. There! You’re done!

As you can see, although this is an electrical repair, it is easily within the grasp of anyone.  Don’t be afraid to try!  You’ll feel like you have a new car!

122 Responses to How to Repair the Comfort Control Module (CCM) for the Volkswagen Passat

  1. Martin says:

    THANK YOU!!!

    Now the internal lights work, the fuel tank opener works!!
    Thank you :)

    • Peter Loo says:

      Hi Martin

      I have fixed my windows playing up by sorting out some corroding wires leading to my CCM box. But I still can’t fix my interior lights. Do you remember whether your interior lights were a like 6 cables soldered to one cable before going into one of the 2 big connectors to the CCM? Many thanks Peter

      • Tom ERik says:

        interior lights is a red wire with a black stripe,, it splits out to 5 wires i belive, and is in the bundle under the door.

      • Adnan ali says:

        Hi Peter,

        I have changed all the 4 doors for my Golf GT Tdi Mk4, central locking and interior lights works but all 4 windows doesn’t work. My Mecanic told me change the Control Unit (CCM) I bought it 2 hand for £50 but still it’s not working. Can you please advice something ?

        Many thanks
        Adnan

      • Rolf Jacobsen says:

        hello

        I got poor electrical “feeling”

        Need a comfort module (used?) for my 1997 18.8 bensin
        Anyone that casn help

  2. Jimbob says:

    I jus hope mine works my car don’t start

    • Jake Johnson says:

      I have a similar problem with a 2004 TDI. Water came into the driver’s and passenger’s side floorboard. Now I have a problem with the transmission showing all gear positions lighted up. When this happens the car will not start. I believe this may be fixed by the TCM (transmission control module) under the carpet on the passenger side.
      The AC does not work now either. Perhaps it is due to a wet or corroded CCM (Comfort Control Module) under driver’s side carpet. I will give both of them a look.

  3. nathankathy says:

    @Jimbob: Although I am not sure of exactly every wire that goes through the CCM, I’m guessing you may have a more serious problem than a faulty CCM. By all means, open ‘er up and take a look, but don’t be too surprised if it still doesn’t start after fixing any CCM issues – car ignition relies on many different systems, and you will have to simply go down the list til you find the issue (battery, alternator, ignition switch, etc). Best of luck!

  4. Robert says:

    I’m going to try this out this weekend. The previous owner had the car and all of a sudden one day it wouldn’t start. He replaced a fuse and got it to start but the fob, power locks, power mirrors, and dome lights, all do not work. So I’m going to try this and hopefully it does the trick. On my Passat the CCM is located on the passenger side. Wish me luck.

    • Erick says:

      I’m in the exact same situation with my 2001 jetta. First, it was the fuse, then the locks, windows, and dome lights. I’ve got my fingers crossed…good luck!

  5. Jerremy says:

    Thanks for sharing! I got 2002 vw passat 1.8T my CCM is broken and has to be replaced. Can I buy any CCM for my vw passat or the part number or any serial number has to be the same as my old CCM’s number? Do I have to programm it after when I will replace it?

    • ManueL says:

      did you find something cuz i have the same problem with mine i buy one SH but dosen`t work at all ! no lights no windows no central looking and the gay told that i need to programm it … or something like this what to you know wabout that ?

      • nathankathy says:

        Manuel, if you bought a Passat, then I would suggest you open up the CCM and check out the electrical components. I do not know what the guy would have been talking about in programming anything (the CCM is not programmed), unless he was referring to the radio, which (if the battery has died) will need a code inputted to unlock it.

      • Dan says:

        The key fob will need reprogrammed if you change you ccm.. It is the alarm brain.

  6. john says:

    thanks for your help it was just great—–! about four splices in wiring going to control unit under left front seat, all required reconecting as they were separated by corrosion not easy to spot as they are taped up, they have to be uncovered to reveal the faults, just as you indicated, when fixed all systems were go, except rear left hand door which had three broken wires due to door being opened and closed a million times

  7. Jhon says:

    I have read that the gasket where the pollen filter seats wears out. I have a huge leak and I suspect it is from there. The odd thing is that the pollen filter is on the opposite side of the driver’s…My CCM is COMPLETELY shot. 5 gallons of water pulled from the drivers side with a shop vac. The plugs to the CCM are shot too. The car wont start. The plugs to the CCM and the CCM need replacing. Need to find where to get one second hand.

    • Jake Johnson says:

      Look under the carpet on the passenger side. The Transmission Control Module is there. It can illuminate all gear positions on the transmission and cause the car not to start,.. even TDI.

  8. Greg says:

    This is very helpful, as I have found many corroded splices down there since I first looked at your page. However I’m trouble locating the wire that goes to the windows. Was it solid black or did it have a different color tracer? Also, did it run to the blue connector or the tan one.
    Thank you,
    Greg

  9. nathankathy says:

    Hi Greg,
    It was a couple of years ago, but my memory says that the wire was black only. Greg, the only wire we ended up repairing was the windows one, so all the pics above are of the windows wires. I hope that helps!

  10. Greg says:

    I got in there the day before yesterday and fixed another 4 or so splices, now everything works again! Thank you.

  11. Clint says:

    your tip worked wonders for several electrical problems. Unfortunately upon reassemble the fuel pump is not pumping. Is there anything that will need to be reset?
    Thanks!!!

    • nathankathy says:

      Hi Clint,
      I am so not a mechanic, so I asked my brother your question (who, btw, is). Ok, choice #1: the fuel pump just chose a lousy time to crap out. Is this it? Well, try out the other choice fixes but you may land here at the end of the day and just have to buy a new one. Choice #2: something got screwy with the wires when you fixed your other probs. Check the grounding on your wires. Choice #3: what year is your Passat? Because later models (than our ’98) have an immobilizer; bro theorizes that if your immobilizer got reset it might have messed up your pump (I’m not quoting verbatim, so excuse me if that doesn’t make sense)…um…don’t know how to fix that if it is your prob. Quick crazy check: bang on the gas tank. Try to start the car. If it starts, then doesn’t start again after being turned off, it’s the pump itself. If it starts again after another whack, definitely replace the pump.
      I hope all this helps, it’s the best I can do. Blessings!
      Katherine

  12. Syllamo says:

    Thanks for this great How-To.

    This got me through me repair and now it is like a new car.

  13. thank you for all your advice. My car is flooded with water and pulled out my box and it was drenched. Letting everything dry out, but am sure I have to buy a new CCM. Everyone talks about a used one. What are the prices of a new one and how do I prevent my car from getting water in the inside. Can I cover the box up with a plastic bag to prevent this in the future.

    • nathankathy says:

      Hi there,
      Make sure you don’t try using it before it’s dry; it may actually work after all and you won’t have to buy a new one. I don’t know the pricing on these, sorry. I would suggest checking your drainage holes to make sure they’re not plugged, as they are often the culprit for CCM damage. On the plastic bag idea – sure, why not? But checking the drainage holes will be a more direct solve. :D

  14. damiano says:

    salve a me non funzionano più le chiusure centralinizzate ma tutto il resto si i telecomandi sono perfetti come posso risolvere?

  15. damiano says:

    salve a me non funzionano più le chiusure centralinizzate della mia passat del 2002 i telecomandi fuzionano i vetri anche e anche le luci come posso risolvere?

    • nathankathy says:

      Scusate se questo è difficile da capire, ma ho dovuto usare il traduttore di Google. Io non sono sicuro di come risolvere il problema. Provare a riparare i cavi che sono rotte, come descritto qui. Se ancora non funziona penso che dovrà portarlo ad un meccanico. Spero che questo aiuta!

  16. Don B says:

    My A/C quit working, presures ok, compressor ok when jumped with voltage clutch engages, plug at compressor seems dead what should or could I check next, does the comfort control module control this ????
    Thanks Don B

    • nathankathy says:

      Hi Don, I don’t think the CCM controls anything to do with the AC. But, I am not a mechanic, just related to several. On the other hand, we had a very similar problem with our AC in our 02 Safari van that cleared up once the system was vacuumed out and refilled. I would suggest you get somebody who knows what they are doing to take a look. Best wishes!

  17. gerardo says:

    I your bog is very helpful thanks!!do you by. Chance know whew I can find the ccm in a 98 beetle?is it in the same spot?

  18. Christina says:

    thanks for all this information! iam taking my passat apart to dry my ccm and carpet! live in colorado and we have had alot of rain and have been with 2 plus inches at least 4 times in two months. my dash light stoopeed working, everything else works except i have never had dome lilghts since i bought this 2001 3 years ago iam hoping this fixes all my interior lighting problems. one question? my carpet really doesnt want to let me get the box out, do i just pull it out and hope i get it back in correctly? and do i need to take the left foor rest ( the plastic piece) off first?

    • nathankathy says:

      Hi Christina, sorry about the wait. Have you tried releasing the carpet hook? I don’t have a pic of that, but I think that the headfuzz article does. You do need to take off the foot rest first. Have fun!

  19. NNick says:

    my CCM is in water, if buy another ccm does it work in my car?

    • nathankathy says:

      Hi Nick,
      Well, if your CCM is or has been completely submerged, I would guess it would need to be replaced. First dry it out and make sure though. Next, all your wires will probably need to be replaced, so if I were you I would look to replace the whole unit. You will have to check with the dealer or someone who knows more about which CCM will work in your car, I don’t know enough to answer that. Best wishes!

      • Mat Gilliam says:

        I had the problem with my 2001 Passat. Water soaked the CCM. A used one won’t work. The dealer needs to order one specific to your VIN No., then program it. Unfortunately very expensive–cost me about $1000, and I took the car apart myself. Had to get car towed because it wouldn’t start. Caused by plugged sunroof drain. Lesson, check your drains regularly. Dumb design to put electronics in lowest part of car–where is water going to collect?

  20. Alex says:

    Thanks for the article – I have the same problem and will give it a go this weekend. You refer to the
    location of the CCM as in the driver foot well – presumably this is the left hand foot well in the USA.
    I am in the UK – the article in headfuzz.co.uk refers to the passenger foot well – so I take it the left
    side. I will explore the passenger foot well first in my right hand drive UK car.
    Thanks again Alex

    • nathankathy says:

      Hi Alex! I would be interested to see which side you find the CCM in! Can you reply to this with the results of your fix? Thanks, Katherine

  21. Mike says:

    Oct 2011 – Skoda Superb 2.8 Petrol 2002 UK model.

    The CCM is always found under the left front carpet – i.e. Driver side if Left Hand Drive model (USA etc), or Passenger side if Right Hand Drive model (UK etc). The problem is caused by water leaking in from a broken seal underneath the black plastic housing of the pollen filter. Water soaks into sound proofing sponge and dripps onto a main wiring loom where it tracks along the wires into the CCM unit and eventually fills the front and rear footwells.

    Therefore, sealing the CCM in a plastic bag will NOT fix the problem as water will eventually find it’s way back in again using capillary action along the wiring loom.

    To fix the pollen filter seal sounds like a lot of work but is actually quite easy. The only out of the ordinary tool you’ll need is a spline key (sometimes called a star key) It looks a bit like an alan key and just as cheap to buy.

    The pollen filter is located under the bonnet (hood) on the same side of the car as the CCM. It’s just under the windscreen beside the battery.

    Ok, from this point all references to left and right are used as if you are standing in front of the car looking into the engine bay.

    Remove rubber seal running right accross the engine bay that holds the large black plastic cover at the rear of the engine bay (this just clips on so simply pull it towards you gently).
    Remove large black plastic cover to expose battery and pollen filter etc.
    Remove small black plastic rain deflector near top right hand corner of engine bay using spline or star key (only one bolt holding this on).
    Remove small black plastic caps on windscreen wipers (lever them off with a small flatblade screwdriver).
    Remove both wiper arms by undoing nuts and gently levering up with large flatblade screwdriver.
    Remove the two clips holding the black plastic moulding attached to the bottom of the windscreen (one is approx’ in the centre and the other is on the left.
    Starting at one end, carefully ease the black plasting moulding away from the windscreen (pops out in the same way that the two seals on either side of the windsceen – but you dont need to remove these). You may need to use a wide blade such as a wallpaper scraper or similar to start with, then it should just pop off).
    Remove three nuts holding the black pollen filter housing.
    Remove pollen filter housing to reveal rubber seal underneath (it’s the outer seal not the sponge inner seal).

    At this point you can buy a new seal but it comes complete with the black plastic housing as an assembly at a cost of approx’ 15 UK pounds sterling from a main dealer.

    OR

    You can remove the seal and replave it with some silcon mastic sealant (the type that you’d use to seal the bath) and leave it overnight to set. Be sure to clean and dry all surfaces before resealing.

    Next, reassemble everything in reverse order and that’s the leak fixed!

    Obviously, you’ll need to thoroughly dry and clean out the CCM, carpets etc as described in other blogs above, but if you need a new CCM it’ll cost approx’ 250 UK pounds sterling and if it needs programming that’ll be about another 50 UK pounds sterling from a main dealer. Therefore, it’ll be worth searching the web to see if anyone does a cheaper repair/replacement CCM.

    Hope this helps, Regards, Mike H

  22. dave newman says:

    have a 01 passat glx 4motion. None of the steering wheel controls work.Cruise,volume and horn.All the fuses are good. The air bag light is not on also the controls don’t light up.Could this be related to the CCM or the wiring leading to it.
    Thanks

  23. Jim Carroll says:

    1998 Volkswagon Beetle 2.0 Liter engine light is on it doesn’t communicate with OBD scan tool for DTCs. Has an after market radio we removed it, unhooked the battery for 15 min. and still can’t communicate with it. Has anyone had this problem? Thank you.

  24. Brenda says:

    My daughter just bought a 2001 Passat. It ran good for 2 months. She drove it to a meeting and when she came back out the car would not start. It has a new battery and they horn does not blow, no lights, no nothing. I am stumped, could this be the CCM or something else. It is like someone pulled a kill switch. I appreciate your help.
    Brenda

    • Jacob says:

      Brenda–
      This just happened with a 2001 Passat I just bought. . .Did you find the solution? I would be super grateful to know what went wrong or what fixed the problem. . .
      Thank you! Jacob

  25. christopher says:

    my 1998 passat 1.8l 20 v turbo switches air con on when car starts. Any solutions

  26. sheny says:

    I know you are talking about a Passat but I have a problem with a Jetta 2000. my dashboard lights do not work and then one of my tail lights is not working and the diagnostic was that my comfort control unit is bad. where can I find it in my jetta plus how do I repair and if I replace it does it needs to be programmed?

  27. kelly says:

    Thank you SO much for this advice. Interior lights,windows,and starter would not work. We found some corroted wires and it was such an easy fix.

    • tracey says:

      do you know which wires were for the starter? am having this problem now, when i pulled my wires out, most had been fixed before, and they are almost all needing put back together, But I really want to get the car to start, before I work on all the wires.

  28. Robin Gersbeck says:

    Thanks Guys, Am keen to try this tonight and will let you know the outcome. Just for the record, I checked with 2 X VW dealers (their spare parts depts) and was quoted $400+ to replace the module (new only available) plus fitting, so your solution certainly has appeal !
    I will let you know how I go.
    Best regards,
    Rob Gersbeck

  29. john vitale says:

    i replaced the battery ,coil ,new wires,spark plugs now the dash light flicker and the exterior light flicker but car runs fine if i leave car sitting for a week all dead and need a recharge .i just installed a new alternator but still same problem and ideas hat it could be

    • nathankathy says:

      Hi John, we have the same problem with our car dying after a week of no driving. Our car does it because the computer doesn’t turn off while the car is off. It sounds like you have something still running while the car is off. It might be the computer not going into standby, which you can tell easily if you can see the digital display while the car is off; if this is the case you can replace the computer. We just bought a battery charger. Hope this helps!

  30. dene says:

    Hello.Seems that this Passat CCM problem is world wide. Have the same problem with the rubber nipple drain under the battery housing, clogging with dust,leaves etc and flooding the interior compartment. VW Australia are about as helpful as boobs on a bull with information to fix.Just want the car in their workshops. Thanks for your detailed description on how to attempt to fix this Nathan..Siliconing a inch hose into that nipple drain keeping it open has helped me to drain the battery well. Also a flexible plunger under the battery to clean bigger obstructions has helped. Kind regards Dene Victoria Australia

  31. dene says:

    Hello again. Have looked for that CCM in the left hand side floor well But cant seen
    m to find IS it under the carpet in front of the Seat bracket??? Raining here now hAve to closse windows, Bye for now Dene

    • nathankathy says:

      Hi Dene, Yes, it is under the carpet. In our pics we just lifted the edge of the carpet up after removing the foot guard and the side plastic thing. Then we stuck our hand in and pulled it out. But you can remove the whole carpet too I think. Give ‘er a try and let us know if it’s still not working. :)

      • dene says:

        Hi Nathan. Have remove the ccm and it is in a very poor state of repair. Have chased down a second hand ccm and making inquiries with VW Australia as if i need to get new remote key transponders.All very frustrating/expensive . Now there is another plastic box under the carpet near the transmission Hub/hump.any ideas on the function of this.Haynes manual has no mention of this???The car that i have is a 2.8lt V6 syncro. which i get a lot of driving pleasure with. It’s done 320.000 Klms trouble free except for the electrics.Reminds me of the 1970′s Ducati and Moto Guzzi bikes that i’ve ridden in the past..Fun to ride but not for long.That article from headfuzz is great as well. Oh well better go heat up that soldering iron and do some more discovering. Take care Regards Dene P.S Thanks for the reply

  32. Mark says:

    My daughter’s passat was having issues with windows not working, as well as door locks and fuel door. Uncovered the CCM and found some wires that were corroded and had come apart. Spliced them back together and all works fine. Thank you for you knowledge.

  33. Johnny says:

    Think I am dealing with this issue right now on my girlfriend’s 2202 Passat. Her Climatronic starting blinking and then just stopped working all together. The buttons on the steering wheel don’t work either, and the visor light (that activates when mirror is open) blinks when the driver’s side visor is moved to the down position. She’s also had water in her car after leaving it out in a heavy rain.

    I thought for a moemnt it might be the Homelink Visor issue that shorts out from the visor being moved up and down, but wouldn’t that cause the fuse to blow and thus those components be not working at all. They worked intermittantly for a day before going dead? That leads me to believe it is a wiring or ground issue. Is that a safe bet?

    So am I basically just pulling the Comfort Control Module and looking for bad wiring? Will I have to remove the tape on the wires? Great information here.

    Thanks

  34. Cos says:

    Thanks u guys just saved me a bundle

  35. nabeel khan says:

    hey guys, awesome page ive been having the same issue on my 99 passat initially the central locking became tempremental stopped all together now windows where working but very juttery and now they have stopped working aswell, actually built up the courage to look at something electrical on the car, got it openend and found a damn under the carpet, dried and drained it all out, use the wife hair dryer (she wasnt impressed) to make sure all dry took apart the ccm box dried it put it all back together but nothing, do you think the ccm needs to be changed all together im thinking so. now ive put it all back together the little alarm light on the drivers side has stopped working, and the airbag warning light has come on. ive given up now so my mechanic is going to have a dabble at it, but have to wait a few weeks..

    but thanks for the imagery on the page and the walk through i might have another look next week.

    • nathankathy says:

      I’m kind of amazed anything still works. And yes, I would guess you probably need more repair than a simply electrical line change. Best wishes! :)

  36. tony says:

    After hours of trying to repair my car I stumbled across this, within 5 minutes my car is all fixed, interior lights, central locking, electic windows and mirrors, two wires just as you said and from a fellow christian! thank you!

  37. Shirley says:

    What are we checking for with the multimeter?

    • nathankathy says:

      Hi Shirley, the multimeter is useful for checking if an electrical wire is active. We didn’t use one because our problem was obvious once we got the box open, but the multimeter would have been good to check the wires if that hadn’t been the case.

  38. Jose A. Suarez says:

    Good morning.

    I have the situation with my Jetta 2001: have a consumption and the batterry don’t start the car when don’t used daily. I verify the system and all issue do to Confort System Central Control Module. Fuse 14, can help to resolve the issue.

    Thanks.
    Jose

  39. Marguerite says:

    I just torn the 98 passat apart and com is dry and looks like new as do wires. Still have no dome lights and getting it to start is like a fire drill. Any ideas. Clicking noise from relays?? Could it be the ignition relay?? If there is one? #ccm # vw #passat

  40. andy mackadandy. says:

    Thanks man I’ll need to give this a try, I have no internal lights, windows, fob immobiliser doesn’t work I need to use the key, and the blowers or a/c don’t work, the alarm wouldn’t shut off so I had to cut the sounder off. To any Brits or anyone else that is awkward enough to drive right hookers, the CCM is always in the left hand foot well, so that’s passenger side for us, drivers side for almost everyone else. I knew all my electrical woes had to be related, it was too much of a coincidence that they all stopped working together, when it’s very quiet I can hear a wee clicking noise coming from where I now know the CCM box is, the other thing that gave it away was, I could get the blowers to come on sometimes by slamming the passenger door, it was obviously jiggling the wee box, anyhoo can’t wait to try this, as driving in the winter with no blowers to demist the windscreen etc and also not able open the windows to let the steam out is frustrating at best, and down right dangerous at worst.

  41. Paul says:

    Thank you for your Blog! Your information on tracing the wiring in my 1999 Passat Wagon has been a great help! My car wouldn’t start windows,lights,fob,etc not working on several occasions recently leaving me to “bum start” the car.Your info has helped me to trace the problem to 1 little wire! God Bless you and your family on your journey and the work you are doing in the world!

  42. ty ty says:

    thanks for your help all what you said was spot on,super dooper blog.once again thank you

  43. Josiah John says:

    Good day ,please am using a 2006 passat sedan 3.6 (v6engine) ,its has not crank in months and on programming its showing immobilizer active,will start just 3 seconds and goes off please advice me on what to do ,am just so confused and frustrated,your advice would highly be appreciated, thanks in anticipation .

    • nathankathy says:

      Sorry, Josiah, I don’t think that we can help. Maybe someone else reading this can? It sounds like your immobilizer is activated and you probably need a VW mechanic to reset it.

  44. Tuna says:

    Thanks for the info that’s was the problem stripped the side and fixed the wiring loom in several places now working like a charm.

    Thank you again.

  45. Rudy says:

    My 2000 Passat has problems with the interior lights staying on after you lock it upon exiting the car, and after you start it. The interior lights also stay on the whole time you are driving. When you exit the car and lock it, they will eventually time out and go off. Any ideas on this one? Could it be the CCM.

  46. kayla says:

    I have a voltswagon passat 1998 my driverside floor got flooded and nothing worked and my car wouldnt start , ccm looked horrible and so did the wire harness ,so i got a used ccm nd spiced all the wires so there not corroded anymore ,,now my windows wont go down and my car wont start. I realy would love to fix this car, it was perfect, nothing wrong with it till it flooded the front driverside. Any info would help,

  47. Russell (+Otto the car) says:

    Hey, Nathan y Kathy.

    1998 Passat 1.8t. Same problem. Leaky moon roof and clogged engine compartment drain under the battery kept the carpet wet for years. As system after system died, dealers kept saying, “You need a new module (computer).” Refused to pay for that, but did not understand what was happening. Finally, the driver’s window died: no more paying tolls or eating at the drive-thru. Took the car to a new VW dealer in East Orlando (FL) who after one hour brought me into the shop and showed me the rotting wire bundle under the front carpet. “We can’t fix your window, you need a new wiring harness. $3,500.”

    Drove home and a light bulb went on: I have worked on 12 volt boat systems for years, and already had all necessary shop manuals and wiring diagrams for the car. I had seen nothing I could not fix. Tackled the job this past winter… cut away the carpet, took out the seat, disabled the air bags, built eight (8) long shunt around all the damaged areas using distinctive green wire and wire nut couplers. All systems (mirror motors and heaters, door locks, windows, rear window defogger, interior lights, security alarms, key fob remote entry, etc., etc.) restored !!

    Got so good at it, I managed to clean, repair or replace the glove box handle mechanism, AC/heater blower motor, cruise control and the original throttle body — restoring power with a perfect idle. What fun !! Couldn’t do it all without the VW forums on the Internet. Amazing.

    Thought I was the first to do the rewiring. Now I find you did it earlier. Congratulations. Love to meet and compare notes some day… : ]

  48. Russell (+Otto the car) says:

    P.S. The irony is… the wires were rotten, but the adjacent Convenience Control Module (the computer sealed inside the black plastic box on the floor underneath the carpet) was PRISTINE. The box and its seals had held through a decade of intermittent immersion. So… the computer (and the timing programs and other firmware written into it in Bavaria seventeen years ago) are once again running the show. Incredible !!!

  49. jonathan pressburger says:

    can’t help re ccm, but my passat 1995. I’ve had problems with the auto gear position switch/sensor. It’s in PARK, but it doesn’t know it. Moving the gear lever into park again cures it. Symptom, ignition key in and dash red lights come on but no response to turning ignition key. Just a thought. Anyone got info or link with auto transmission problems. I’ve had the “module” replaced as well as i think the auto gear box and now no fifth gear (did it ever have it???) and there’s a faint vibration in the steering and the transmission (????) seems noisy. I’m not mechanically minded but good at electronics. I’m in THAILAND and there’s cultural as well as technical difficulties and short of a main VW dealer in BKK (200 km away) i’m in the hands of a very pleasant friendly competent local guy who is not totally clued up i fear. THANKS.

  50. Alexis says:

    where is the computerbox for the vw polo located?? i cant see it on the front passenger’s seat.. am stuck..

  51. Alexis says:

    so cute.. i love this info……

  52. Edgar says:

    Thank you for this write up. Saved me from buying expensive stuff that I thought were the issue. I would like to add that in my case the bad and corroded wires were not inside the box but outside leading to the box. They were red and black and another color I can’t remember. Anyway, thanks a lot. :)

  53. Danno says:

    I know this is a older post but I’m very thankful for it. After all the rain we received over the last weeks I went to start my car this morning with no luck what’s so ever. Also doors, windows, and other things would not function. Looked at fuses and number 14 was blown tried to replace but it was kelp on doing it. Then found this web page removed my carpet and what to my surprise that my ccm was submerged in water. I took it out dried up all the water, dried ccm, and plugged it back up. The only thing I did different is I move the ccm from under the seat. Didn’t want to place it back in a place for it to get wet again. It took some imagination but is doable. Again thanks for posting.

  54. Jo says:

    Greetings from Iowa, USA…I have a 1998 Passat that hasn’t ran in 1.5 yrs. I gave up on it when I found another junker that would actually start every time I turned the key. Now that my other junker is dead, I’m doing my best to figure out what is wrong with the Passat.

    Trouble started shortly after I inherited it from my brother:
    – The windows would come down on their own (usually part-way)
    – The alarm would go off intermittently (I would have to turn the key in the trunk to disengage)
    – The battery would be dead first after a week or so. Then a few days. Then a few hours (I replaced the battery to no avail)
    Now, 1.5 years later, after changing the battery again, putting a little Heat in the gas tank and replacing the tires, it started once and ran for about 10 minutes (idling), then died and hasn’t ran since, which was a few days ago.
    After reading your blog, my boyfriend checked the wires going into the CCM and they appear to be fine. We looked at the CCM board itself and appears to be in good shape. Oddly enough, the light on the door next to the driver’s lock began blinking after we put everything back together, and the alarm appears to be engaging now by turning the key in the trunk. When we try to start it, the alarm goes off and the only way to turn it off is to turn the key in the trunk again (I don’t have a fob).
    The digital readouts on the dash (the mileage and the digital clock) stay on all of the time. I’m assuming something is draining the battery but there may be multiple other issues.

    I’m frustrated and don’t have a lot of $ for repairs. Any other guesses what this may be? I can have it towed somewhere for a diagnostic, but would rather have someone tell me what an idiot I am and to check _____…
    Thanks for any help you can give!

    Peace

  55. Matt says:

    Good Morning from Maine. I have a 2002 Passat. My driver’s side door lock doesn’t respond to either the key or to the unlock/lock switch on both doors. My interior lights don’t work either and I’ve also been experiencing random trunk latch openings while driving. After some pretty extensive research on this issue I thought the main cause of my problems was the CCM. I attempted this fix this past weekend.
    Door Latch:
    After checking the wires I had noticed that it appear someone else had already attempt a repair. I didn’t however notice any real issues with the wires. I pulled out the circuit board and noticed corrosion on several of the terminals for the pins. I cleaned the terminals and wire harness connectors. While the ccm was removed the back door latch worked using the interior unlock/lock switch and would work once directly after the CCM module had been plugged in. After this it stopped working. I checked the continuity of the harness and the ccm after cleaning and got a good connection. But it still doesn’t work.
    Interior Lights:
    23 Harness Pin #20 I believe Red/black wire. Checked continuity for interior lights fuse 3 & 4. There was a good connection between the fuse panel and the lights. But no continuity from the fuse panel to the wire harness pin number 20. I was unable to locate any break in the wire however. Interior light still don’t work.
    Boot latch:
    23 Harness Pin #2 Brown/yellow wire I believe, cleaned connection points on harness tested continuity good connection. Have not had a problem yet with the boot latch releasing unexpectedly.

    Any ideas for the interior lights and the left side door lock?

    • jonathan pressburger says:

      sounds mechanical to me, if door knob doesn’t work either BUT i’m a fellow owner and not a good mechanic altho i;’m ok with electrical things

  56. Matt says:

    Also thanks so much for this write up! Truly excellent!

  57. jonathan pressburger says:

    sorry, again no useful fixes, BUT with my 95 Passat the boot latch drive ENABLES whenever the key’s inserted in the driver’s door and turned. I thought this was normal but now i suspect not. The lock had to be removed as it wouln’t unlock–but this seems to have been mechanical. I’ve not yet replaced the lock as unnecessary and expensive here in Thailand. The motor still drives whenever key turned in driver’s door lock for some ten seconds or so, As for auto transmission, it’s happier now. A coincidental in time new fault with replacement of gear box and control unit seems to have been with the exhaust or cat converter (? language difficulties). There was loss of power and a lot of heat under the car noticeable when getting out. As it’s also lpg fuelled i was afraid it might blow up ( lol ??), they replaced part of exhaust system and it’s like a new car (almost), also a vibration in steering seems to have been front left wheel bearings. I hope this is useful to someone. Labour costs here CHEAP! TEN US $! to replace whatever in the exhaust system and wheel bearings. Total cost 100 US with parts.

  58. Pingback: Vag com og diagnose - Side 2

  59. Omar says:

    My Passat 99 V6 when I try to start the car it has a fuse #10 in the relay of the alarm ant then it burns, before was the only thing that lets starts the car, then I try with a piece of cable but do nothing. Please if somebody knows what can be the problemm please respond. also the CCM is very damage I have to change it.

  60. Claire says:

    HI – I just bought a second hand Passat. The interior lights do not work, nor does the central locking, or the fuel cap. I am based in the UK. Could some one advise which side of the car , in the UK the CCM is located and i will attempt to repair. Thanks

    • it’s always on the left hand side of the car, IE the left hand side if you are sitting in the car facing forward, so on a UK car it the passenger side, a US or any left hand drive, it’s on the drivers side

  61. Ian says:

    Hi there . I’ve just got a passat tdi sport on a Y reg (2001) . The central locking ,interior lights and windows don’t work , I’ve taken up the carpet on the passager side and by the looks of it someone as been playing about with it . The ccm box is missing and the plugs are all corrored and to make things worse the are 4 wires free from the plugs . How would I be able to solve this problem . HELP ! Anybody please

  62. gerald says:

    Hey it might be the dome lights by the sunroof. Pop it out and disconnect the connector.

  63. Marcos says:

    Hello nathan how are you? I have a Passat 99 1.8T needs a new CCM, I have a 2001 also, can I put my CCM from my 2001 on my 1999 Passat? the diference is that the 99 have only one plug, and the 2001 have 2 plugs, but one of them looks like the same.

  64. Geir says:

    Thanks man, this was really great information, everything works fine again. Greetings from norway :-)

  65. Ian says:

    Hi there . Just bought a passat and the iterior lights don’t work and the boot Alarms to say it’s open on the dash . You have to open the boot with the key to as it does not open with the key fob and now the petrol flap don’t open. If looked at the ccm and cut the bad wires back but the are very bad . They break when you swist them . I’ve joined the but still have the same problem . Can someone HELP !!

  66. Just want to add something to the debate here, I think I have thanked you already for the tut in an earlier comment, but thanks again. In my case I took out the CCM as described and it was perfect, dry as a bone, no sign of any water ingress at all. So for the last 18 months I have just lived with it. Only able to open the windows by using the key, which didn’t always work, no central locking, no heaters, no interior lights etc. Yesterday, what with winter coming and no way to demist the car, I decided to bite the bullet and take it to an auto spark. Wish I had done this years ago, the bill came to £165, which included £120 for a new heater motor, so even if the guy only charged £15 – £20 for fitting it meant that the CCM issue was sorted for just £25 – £30. The heater apparently is nothing to do with the CCM, which I thought it was but the electrician showed me the circuits and indicated that it wasn’t connected to the CCM, but it had been caused by water ingress, the water had stayed in the scuttle in the front and flooded the blower motor, but never made it into the car, the guy even cleared out the clogged water drain and all the crap from the scuttle. The CCM fault was just a wiring thing, and I now have interior lights, central locking, windows and heaters working. Anyhoo if you are in the Glasgow area, Partic Auto Electricians are the ones to go to, don’t try and phone them as they don’t answer the phone, you need to go and see them, which shows how much custom they have, well recommended anyway.

  67. Tom says:

    This flooding of the CCM happened on my Audi A4, (1.9SE) a few weeks ago. I dried everything out and fortunately the module worked with only one residual fault – the trip mileage display on the instrument panel showed ‘Def’ instead of the mileage.
    Two weeks ago the passenger footwell flooded again!! Thinking that the drain plugs under the bonnet were blocked I removed the battery and found a lot of corrosion caused by battery acid, (There is a breather pipe connected to the battery by a small rubber pipe and this had fallen off allowing acid to leak out behind and under the battery).
    One of the corrosion points was about 2″ in diameter through the bulkhead close to the point where the aircon pipes pass through. This hole was letting water pour into the cabin directly behind the glove box and of course this all ended up in the footwell where the CCM lives.

    I repaired the holes with fibreglass and tested it with a hose for several minutes – dry as a bone.
    After this second flood the CCM didn’t come back to life and I had to get a replacement, £100 from Ebay, (£340 from Audi). Everything worked except for the remote locking.
    To reprogram the remote I inserted the key into the ignition switch and turned it to ‘ON’, (don’t start the engine). Then I inserted another key into the driver’s door and locked it and unlocked it manually
    This programmed the key and everything appears to be working as before.

  68. sal says:

    what controls the climate control panel in jetta vw 2005 …i have no fan for heat and a/c but climate knobs do work temp up and down also no vent selection buttons work but heated seat function does work fine also no led lights on climate control unit work ……hhhheeeellllpppp

  69. sal says:

    hi again does the ccm control radio-climate control-wipers-trunk switch etc?

  70. sal says:

    thank you hope hear back soon

  71. if it’s the same as mine the blower isn’t controlled by the CCM, but has been damaged by water in the scuttle at the front of the car.

  72. namegi says:

    Good job dude .. I found my ccm but it’s clear .. Wiers also but 2 much whater I have no idea what can I do next :(

    Thank u again

  73. justracing says:

    I’m in the uk and have a 2001 Passat estate with a fuel flap that opens intermittently. At the moment I have wrapped a bit of tape on the fuel flap to stop it closing altogether and over the weekend I cleared the drains under the battery holder and the brake servo together with renewing the pollen housing seal, all of which are major areas of water ingress.
    I have pulled out the ccm box from under the carpet on the passenger side expecting to find water/dampness and corroded wires but oddly enough the unit seems as dry as a bone. I have not had a chance yet to establish continuity of the various connections but does anyone know which wires(colour) are related to the fuel flap release?
    I should add that 3 years ago I had a flood in the rear drivers side rear footwell which I dried out after clearing the drains at the front but the only ensuing electrical problem following this was the tailgate which locks itself without warning. I lived with that one for a long time but the fuel flap issue demands some more positive action.

  74. Arthur Nhari says:

    hi
    i have a 2002 vw polo, where do i find the CCM. My driver side window controllers dont work but all windows work individually. all my power mirrors wont work.

  75. Arthur says:

    I have an issue with my lights and indicators on my vw caddy mk1. There is a control unit that they say is responsible for that. I do not know the name of that control unit hence I find it very difficult to find the particular part. I would be grateful is someone could help me out with the name of the part. I am really desperate and have been searching the Internet frantically for the part but I always draw a blank because there are thousands of control units that I come across but not the one that controls lights and indicators. Please help, I am desperate. I only need the name of the part.

  76. Pingback: 2000 Passat Gls Windows/locking issue pls help!

  77. Karolis says:

    Hello. My wires was disconnected when i open sill. Can anyone help me? From back: 4 wires red/black; 2 wires red/blue, 1 wire blue/electric-blue.
    From front (from fuses box side): 2 wires red/black, 2 wires red/blue (1 of them more thick +12v); 2 wires blue/electric-blue. From the comfort control box: 1 wire red/black, 1 wire blue/electric blue.
    Please help me to join it correct.

  78. Annie says:

    Just changed my sons CCM and windows now work and car starts but has no power. (like running on less cylinders) would wrong ccm wiring affect this or just coincidence?
    thanks

  79. David says:

    I have a vw estate sport 01 the10amp fuse for the air con steering controls and heated seats keeps blowing have looked at the black box although wet around it is bone dry inside no corrosion
    Any ideas
    Ta

  80. Jake says:

    Hi,

    The alarm on my 2003 passat keeps going off. Can anyone tell me if the CCM is the likely cause, does it control the alarm.

    Cheers

    Jake

  81. Jake says:

    Hi,

    Fixed it. I lifted the carpet and the footwell was slightly damp, but cables and CCM were all in perfect condition. I took the boot liner off and put some WD40 on the spring that controls the boot lock and locked / unlocked a few times. I now get flashing indicators when I lock the doors with the key fob, they have not done that for ages. Also, no faulty alarm going off.

    If your alarm keeps going off, check your door catches, specially if you indicator lights don’t flash when you lock the doors.

  82. Robert711 says:

    HI, I have just figured an easier way to recode a key with only 1 key. you dont need to take the door card off. I have a 1998 1.9 tdi Passat and have just done it. all you need to do is release the key barrel by undoing the T20 torx screw under the small plastic cap on the side of the door, pull handle out slightly and just pull where the key goes and it will just come out. then wind down window and put key to be coded in the ignition and turn on without starting, then use a flat head screwdriver and put it in where the lock should be and just turn as if it was the key and hold for 15 seconds, then press the buttons on the remote. This worked for me so hope it can help other as it was bugging me for a couple of months.

  83. Mark says:

    With out doubt the most helpfull info iv ever seen great post!!!!!

  84. jamie says:

    Hi, can anyone help me with my 1.8 vw passat estate? My central locking, windows and interior lights aint working

  85. Maddy says:

    We have found where the several black wires connect into one black wire but we are not sure where that one black wire inserts as that wire was completely corroded. Any advice would be much appreciated. Thanks!

  86. Derrick says:

    2000 VW Passat, 177k miles, won’t start, not even attempting to start. Thinking CCM? The lady I bought it from said it drove great when she got it 3 months ago and then it wouldn’t start about a month ago. When turning the key it would light up the dash as if to start but then nothing, i put my foot on the brake and it seemed to short something and now its sparatic flashing and of icons and nothing turns on I.E lights, radio, windows dont work (didnt before i stepped on brake).

  87. Meto says:

    Thank you guys so much, life saver

  88. Derrick says:

    UPDATE* The sparatic lights were stopped by charging battery, odd.

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