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  1. #1
    Established Member Two Rings 99PanozAIV's Avatar
    Join Date
    Dec 26 2007
    AZ Member #
    23653
    My Garage
    1999 Panoz AIV roadster
    Location
    New Market, MD

    W...T...F....is going on?

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    I'll try to keep this as brief as possible.

    2008 Audi S4 Avant, 96,000 miles, no accidents, no major issues

    - right rear brake light bulb goes out, according to sensor
    - remove r.r. Lamp module, replace bulb, even though it looks OK.
    - reinstall
    - all lamps in module, including back up light, are now out with sensors indicating same on dash display
    - remove lamp module again, carefully inspect
    - wires from grommet to multipin plug appear fine, no wear or bare areas or insulation cracking that I can see
    - both contacts (multipin plug and receptacle on lamp module) have slight brown discoloring around the brown wire (hot?) pins (heating due to corrosion?)
    - used very fine file to clean contacts
    - reassembled module
    - worked fine for 2 days, then r.r. brake light and r.r. turn signal bulb sensors activated...neither of bulbs would light
    - removed lamp module, cut hot wire from multiple plug, fed it through small hole in plastic module lamp chassis and soldered it directly to the hot side of the metal chassis on the module.
    - tested before reassembly and all bulbs worked, no sensors triggered
    - reinstalled module
    - r.r. bulb sensor and r.r. turn signal sensor came on again
    - removed lamp module again, checked solder joint (I cannot pull it loose) switched bulbs around, cleaned contacts on bulbs
    - all bulbs work, just none work in brake light socket
    - gave up and settled for just having turn signal and reinstalled everything
    - everything worked!
    - just went out to use car and r.r. brake light and r.r. turn signal show bad again
    - pulled out of driveway to go to store and within a block, all errors cleared and turn signal cycled normally
    - before I got to store, r.r. brake light bulb sensor came on but signal still worked
    - came out of store, now r.r. brake light and r.r. turn signal are out again

    I know if I take it to Audi they're just going to yank the entire wiring harness for that side and replace the whole lamp module and charge an arm and a leg.

    Before I do that, is there ANYTHING that I've overlooked with this?

    Edit: I did have it into a shop where both exhaust clamps were replaced after the band holding one rusted through (see previous thread where I though it was flex joints). Does wiring from the lamps run near enough to any of that that it could have been pinched or crushed while work was being done?
    1999 Panoz AIV
    2008 Audi S4 Avant
    2014 Mini Cooper S Countyman

  2. #2
    Registered Member One Ring TKAUDiA6's Avatar
    Join Date
    Apr 15 2017
    AZ Member #
    397795
    Location
    Panama City, FL

    I had a very similar issue with both my taillights. The best thing to do is probably buy a new assembly. They are about $150 each but that is what I ended up having to do and now there are no error messages when starting the car and all lights come on as usual. The problem I believe is the ground, which is the brown wire you said with the corrosion. I cleaned the contacts as well and even regrounded the wire to another ground which settled the problem for about two weeks then problem came back. It's best to just buy new assembly. Check out partsgeek.com they will have a new one to you in two days.


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