2005 Audi A6 electrical problem

Simon Finnigan · 2012-08-11T07:27:09+00:00

Hi everyone,I've got a 2005 Audi A6, 2.0tTDI that is showing a weird electrical fault.On starting the car and driving, after a fairly random period of timebetween 0 and 15 minutes the car will throw up four warnings for faultybulbs. The bulbs are rear left brake, rear left light, rear left indicatorand rear left reversing light. All the bulbs are ok and work fine before the errors come up, and startagain immediately if the ignition is turned off then on again. Including(for example) the brake light coming back on as you turn the ignitin backon if you leave your foot on the brake. I've unplugged and reseated the connector to the light cluster, looked atthe light cluster which see,s to be in good condition and checked that whenthe rear light goes, there are still two other bulbs working on the rear. Anyone got any ideas on what this might be?Thanks in advance for your help.

Aug 11, 2012 48 Replies

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Simon Finnigan 12 years ago

I'm still here too :-)

This is pretty much it. Open up the light cluster and get a good connection to the earth part of the metal links inside, then run that cable to a good earth. I'm not really in a position to get photos at the moment sorry, but I do remember that it was very clear from the connector which connection was failing and was therefore the earth.

If you really need a photo, I could probably get one on Thursday - if you need it, let me know by email ASAP, and send a reminder on Thursday morning

- got the memory if a sieve :-)

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swhall123 12 years ago

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mitro.vorga 12 years ago

Sábado, 11 de Agosto de 2012 8:27:09 UTC+1, Simon Finnigan escreveu:

You could find an answer to your problem here:

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6ffdf43cb887d354f6

Ou here:

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(it's the first answer)

It's a problem of moisture!

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Tim 12 years ago

Pull up the carpets on driver and passenger sides and check for damp.

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Simon Finnigan 12 years ago

Thanks fôr the reply, I worked it out eventually as an earth problem that was fixed with a bit of DIY :-)

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drufitclothing 11 years ago

I took the unit out, I took of the bulb section and the outer shell i put i n front of a blow dryer on low warm heat for 1hr. I sanded off the bulb con nectors and then sprayed a little WD40 on the earth. I let it all dry. Wipe d off the bulbs replaced them and put it all back in. I left it for an hour then I drove my car. Seems to be working without an issue. Dru

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Scott M 11 years ago

Well, good for you.

But what the hell are you talking about?

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Simon Finnigan 11 years ago

Fingers crossed that'll have it sorted then. Good luck!

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drufitclothing 11 years ago

It did solve the problem for a day or so but the light problem started again! I then changed the bulbs and now it's sorted. I looked at the old bulbs and they were corroded inside and although they would work intermittently that was the problem.

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