High Visibility rear brake light

[Micha_elD]

But we're still having to guess what car you have; its impossible to help when you ask about wiring and fuses, when we haven't a clue what car you're talking about

[s833son]

Apologies - missed that off ! 2005 (D3) A8L 4.2 Petrol

[RJS_90q]

How do you know that the rear brake light is not working ? - do you rely on seeing a reflection in the rear window whilst driving ?

If so, have you checked that the regular brake lights are working ? - maybe an intermittent issue with the brake light switch stopping all the brake lights from working ...

Just a thought...

Regards
Bob

[s833son]

Hi, thanks for the suggestion - the main lights are working - the high level one was intermitent and now wont work at all - you can see it in reflection or with observer. It doesn't show up on VAG-COM as any failure but that might be just the s/w I am using. Tested the unit again over the weekend and works fine with no LED's gone so might have to take it into a workshop

[RJS_90q]

Okay- good info, so now a bit closer to the issue.
Based on this feedback of the high visibility brake lights working normally (when removed from the car) and that the main rear brake lights are working normally then it would seem that the wiring (or a damaged crimp within a connector) to the high visibility rear brake lights will likely be the issue...

If the situation where the high visibility brake light not working remains constant, is there a way of checking the voltage available at each the high visibility brake light connectors (at the high visibility brake light) by using a voltmeter? If no power is available - you will need to check the wiring to understand why... If power is available, check that there is a suitable earth path. Some caution here though - unless you are familiar with the car's electrics it is probably best left to a workshop...

Hope that this helps,

Bob

[s833son]

thanks - tried everything I can think of getting spurious readings on the meter so given up - too cold and wet to do anymore and seem to be getting more and more problems - so into the garage it goes on Thurs for some TLC ! thanks for the advice
Steve

[s833son]

Well the mystery continues, the nice guys at WVC audi ordered a replacement unit to try and it worked fine. Plugged the old one across a 12v battery and wors fine - just wont work on the car. Only has a capacitor and diode in there and all LEDs work so there is no reason why it wont work on the car - but hey ho - new one was not that drastic price so at least its done
thanks to those who advised
Steve

[M3 Compact]

Are these high level stop lights easy to remove on a D3?

Somebody has slid something across the top of mine and ruffled the material covering it. I've had a quick tug at it and a look underneath from inside the boot, but I didn't find an obvious way to remove it.
Has Bose if that makes any difference.