rilot Posted April 18, 2006 Report Share Posted April 18, 2006 Recently my D3 A8 has started throwing up errors such as the brake lights having failed or the passenger door being open. It does this entirely at random and the warnings are completely errornous. Audi say there is nothing wrong and they can't replicate the problem. Any ideas? Link to comment Share on other sites More sharing options...
Ska Posted April 18, 2006 Report Share Posted April 18, 2006 Bad earth or water in the control modules? Is it confined to lights i.e. instrument controls only? Link to comment Share on other sites More sharing options...
Chris_B Posted April 18, 2006 Report Share Posted April 18, 2006 I'd agree that bad earth or water is a likely culprit, parts of the sensor network like bulb fail detection should work on voltage drop IIRC, so unless the control module has died (which should be noticable on a diagnostic), it's probably something like that affecting the wiring loom. Link to comment Share on other sites More sharing options...
rilot Posted April 18, 2006 Author Report Share Posted April 18, 2006 It's nearly always the brake lights it complains about. Recently, when it complains about the lights it also complains about a door being open on the same side as the supposidly failed tail light. Link to comment Share on other sites More sharing options...
cruiser647 Posted April 18, 2006 Report Share Posted April 18, 2006 A bulb is knacked on the rear. It will be the one where the rear stop light is paired with the rear light. The filaments are touching, hence some current goes down the earth for the 'other' light which the computer knows has not been used. I had it on one of my cars - the rear combo light powered up the front fog (very dimly) but enough to trigger the diagnostics thinking some other lights were out! Link to comment Share on other sites More sharing options...
Will22 Posted April 18, 2006 Report Share Posted April 18, 2006 Whenever you change a bulb ALLWAYS change the one on the other side. VAG cars will sometimes give a faulty bulb code before the bulb goes. Now go shoot the dealer that couldn't tell you what you've heard here Link to comment Share on other sites More sharing options...
rilot Posted April 18, 2006 Author Report Share Posted April 18, 2006 cruiser647 and Will22 This is a D3 A8 and as such has no incadescent bulbs for tail lights (apart from reverse and fog). The brake, tail and winkers are all LED clusters. Link to comment Share on other sites More sharing options...
Ska Posted April 19, 2006 Report Share Posted April 19, 2006 Many of these LED bulbs have resistors in series with it I suppose if the impedence varies from different bulb manufacturers that may cause the probs, assuming that they have been replaced with non OE jobbies along the short life of the car; though they shouldn't have as they are suppose to have a much longer life than normal bulbs. Link to comment Share on other sites More sharing options...
AnArtist1 Posted April 19, 2006 Report Share Posted April 19, 2006 Change the post title to:- "Problem with my D3 that Audi 'don't' want to fix." or "Problem with my D3 that Audi 'can not be arsed' to fix." Link to comment Share on other sites More sharing options...
Will22 Posted April 19, 2006 Report Share Posted April 19, 2006 [ QUOTE ] cruiser647 and Will22 This is a D3 A8 and as such has no incadescent bulbs for tail lights (apart from reverse and fog). The brake, tail and winkers are all LED clusters. [/ QUOTE ] I knew that, I was just testing everyone else Link to comment Share on other sites More sharing options...
cruiser647 Posted April 22, 2006 Report Share Posted April 22, 2006 Yeah, ditto! *ahem* Link to comment Share on other sites More sharing options...
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