Passat electrical problems!!!

**tezmos** · 04-12-2005,09:59 PM

Hi - just returned frfom a 350 mile round trip in my recently aquired 2002 Pqassat TDI estate - on opening the door when we got home noticed the interior light wasnt working - further investigation revealed none of the interior lights were working - dash lights etc ok - further checks reveal central locking down and electric windows - dont know what else at this stage - a quick check of the fuses reveal all ok - ones in the end of the dash drivers side - dont know if there are others - any help tonight would be gratefully received

**YorksLad** · 14-12-2005,08:39 PM

I've just had a similar problem with my 2002 Tdi estate. All working fine, then alarm started going off, remote central locking not working, rear interior lights not working and radio doing odd things. Auto electrician diagnosed faulty "Convenience Control Unit" which could only be replaced/ programmed by main dealer. Took car to dealer who seemed to know of the problem and said it would be caused by a water leak (it had been raining heavily that weekend) and the car was steaming up overnight.

Just had report back from main dealer to say car needs control unit wiring looms replacing (they think unit is OK) and a new carpet! Needless to say its not a cheap repair. Hoping they have exagerated damage to carpet.

**tezmos** · 14-12-2005,09:28 PM

Hi - eventually found a blown fuse which when replaced restored my lights windows etc - however am now suffering from a "alternator workshop" alarm coming up on damp mornings or following washing car off with a hose - this lasts about 10 mins before dissappearing - hope this is not the start of more serious problems - alternator has been checked and is ok!

**Sam** · 09-01-2006,05:32 PM

Driver's side footwell.

Pull up the carpet (carefully) and check for water ingress. A lot of people with the above problems will find a few mms of water here. This is where your CCM lives (and dies). The water gets in, usually when your drain holes in the engine bay become blocked - this site helps you unblock them in an excellent step by step way (http://www.weirdlittlebiscuit.com/passat/leak/.

While you're there, check the pollen filter seal for any damage altho on a 2002 this should be doubtful

**Fireblade 918** · 18-01-2006,05:59 PM

Originally Posted by tezmos

Hi - just returned frfom a 350 mile round trip in my recently aquired 2002 Pqassat TDI estate - on opening the door when we got home noticed the interior light wasnt working - further investigation revealed none of the interior lights were working - dash lights etc ok - further checks reveal central locking down and electric windows - dont know what else at this stage - a quick check of the fuses reveal all ok - ones in the end of the dash drivers side - dont know if there are others - any help tonight would be gratefully received

Hi Tezmos
My Passat has just suffered an identical failing to yours, could you tell me what number fuse you had to replace and where it was located.
Regardsl

**nacoya** · 20-01-2006,01:48 PM

Originally Posted by mycarsavw

Driver's side footwell.

Pull up the carpet (carefully) and check for water ingress. A lot of people with the above problems will find a few mms of water here. This is where your CCM lives (and dies). The water gets in, usually when your drain holes in the engine bay become blocked - this site helps you unblock them in an excellent step by step way (http://www.weirdlittlebiscuit.com/passat/leak/.

While you're there, check the pollen filter seal for any damage altho on a 2002 this should be doubtful

hi,

sorry to hijack, but do you know of another source for that step by step guide you mention. The link is no longer valid..

cheers,

nacoya

**foyboy** · 20-01-2006,06:00 PM

I have a problem with the electrics on my passat. The problem is that the indicators periodically don't work both turning left and right. I have also noticed that my temperature gauge has stopped working. I have checked the fuse box to and no fuses have blown. Is it a relay problem! Any advise would be gratefully received. Thanking you in anticipation

**Fireblade 918** · 20-01-2006,08:56 PM

Originally Posted by Fireblade 918

Hi Tezmos
My Passat has just suffered an identical failing to yours, could you tell me what number fuse you had to replace and where it was located.
Regardsl

I have now found the cause of my numerous failures (alarm,e/windows,interior lights etc).I pulled the CCm out from under the wet carpet in the passenger footwell ,in the process of doing this all hell broke loose alarm sounding interior lights flashing.I set about examining the wiring harness,about 30cm from the CCM connectors i found seven factory splices (poorly made soldered joints wrapped in tape)four of these had totally failed due to damp ingress and the other three were badly corroded. I have now repaired all the joints with decent quality splices wrapped in heat shrink tube and hey presto everything now works, even the interior light now works on opening the passenger door,hasn`t done this since i purchased the car!! Hope this is of some help.

**Sam** · 22-01-2006,10:12 AM

Glad I could help Fireblade (I hope it was my post that helped!)

Nacoya - the link works fine for me

http://www.weirdlittlebiscuit.com/passat/leak/ copy and paste it or start at http://www.weirdlittlebiscuit.com and work your way through.

Good luck

Sam

**foyboy** · 24-01-2006,06:30 PM

Hiya, reference electrical fault,

I didn't replaced any of the fuses, but I had experience water ingress into the rear nearside footwell for a lengthy period of time. Having visited this site, a kind user explained how the water was coming in. I have unblocked the drain holes, which were bunged up with debris. I am drying out the carpet areas and hoping the electrical faults will clear itself. If this is not the case I shall have to pull up the carpet and do some fault finding. My temperature gauge now works! however the fault on the indicators is still persistant. Am now going to blast the cabin with a household heater to remove any dampness. Fingers Crossed!!