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  1. #1
    Registered Member One Ring
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    Jan 15 2019
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    serbia

    another taillight failiure, audi b7 2007 avant quattro

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    hi all, already read several threads about this problem. but mine is specific.

    so here it is.

    1. brake light faliure light up on the dash board

    2. i change the lightbulb, nothing happens

    3. i then proced to disasemble the wire harness

    4. the brown wire on connector was a bit burn and plastic melted around.

    5. cut the brown wire from conector, soldered new ground wire to metal rail inside the lights holder, soldered the new wire to brown wire from connector.

    6. still nothing hapens.

    i have tried to measure without bulb i get 10v of voltage, with bulb nothing.
    everything other works fine.

    this one light bulb is for taillight and brake, on the other side works fine, taillight is dimmed, whan press brake full power.

    the bulbs are p21w...

    any suggestion as what i can check more???

    thank you

  2. #2
    Established Member Two Rings ChanceA4Parks's Avatar
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    Jan 23 2018
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    Ridgeland, MS 39157

    Have you tried swapping the bulbs with a known good one from the other side?

  3. #3
    Established Member Two Rings texadelphia's Avatar
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    Jul 05 2016
    AZ Member #
    375723
    My Garage
    2008 A4 Avant 2.0T Tiptronic
    Location
    Portland, OR

    I had a similar issue and one of the contacts inside the plug was brown and discolored while the other contacts were bright silver. It looked like the one contact had corroded. So I wrapped a very thin strip of emery cloth around the end of a flat micro screwdriver and pushed it in and out of the contacts a few times to remove some of the discoloration. Reconnected it with some plug grease and haven't had any problems since.
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    Last edited by texadelphia; 01-15-2019 at 08:21 AM.

  4. #4
    Established Member Two Rings SlvrArrw's Avatar
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    Nov 05 2016
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    384687
    Location
    Richmond, Texas, USA

    I just had a taillight issue on b7 sedan.
    Went the bulb route, also had melted ground terminal in plug.
    So far, my latest solution: Bypass the brown ground wire. I ran a ground from the body in through the taillight breather( rubber cover) and soldered ground wire directly to tailight grounding metal. Light is brighter, no dash errors.
    May need to do the other side now.
    As these cars age, grounding becomes an issue. I know I had a short somewhere, however, the bypass is working.
    Goood Luck.

    Sent from my SAMSUNG-SM-G935A using Tapatalk

  5. #5
    Veteran Member Four Rings Charles.waite's Avatar
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    Jun 27 2011
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    Seattle, WA

    That short is sadly common. Somehow that connector isn't sealed well enough and it arcs until is melts.

    OP that ground needs continuity to the main ground that wiring goes to. You can't just ground it wherever or else you get bulb outs still I believe.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  6. #6
    Veteran Member Four Rings Jay-Bee's Avatar
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    Feb 25 2011
    AZ Member #
    71497
    My Garage
    B7 Avant 2.0T
    Location
    Calgary, AB

    Had it happen to my Avant as well, cleaned the corrosion off the terminal blades with a small file and packed the connector with dielectric grease. Was going to perform this fix but it's been good now for over a year.

    https://www.audizine.com/forum/showt...aillight-Issue
    2008 Audi A4 Avant 2.0T
    2004 VW Golf TDI Stage 1.5 Tune [EGR delete/smart delete/adaptive idle]

  7. #7
    Veteran Member Four Rings Charles.waite's Avatar
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    Jun 27 2011
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    Iíd be really careful with dielectric grease on these. I absolutely flooded both sides of the connectors and every couple weeks the dielectric would screw up the ground and trigger the bulb out. Iíd have to remove the light and reconnect 2-3 times and it would be fine for a couple more weeks. I finally got fed up and blasted out as much of the dielectric as I could with compressed air and itís gone away I believe.

    But learn from me and donít just slather that stuff on...
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  8. #8
    Established Member Two Rings Snert's Avatar
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    Apr 15 2016
    AZ Member #
    371866
    Location
    Minneapolis, MN

    I had to deal with pretty much replacing both the wiring clips for both taillights and using a wire repair kit to do so. Apparently this is a notorious issue for these. Find the connecting clips, snip the wires, use a wire repair kit and you should be golden.
    08 A4 Avant S-Line Quattro 6MT

  9. #9
    Registered Member One Ring
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    Jan 15 2019
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    serbia

    I have replaced lights, from the other working side, same thing.

    i was hoping this problem would go away with ground bypass, but nothing....

  10. #10
    Registered Member One Ring
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    serbia

    as soon i turn the ignition key i get left brake light yellow error.....

  11. #11
    Established Member Four Rings
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    May 20 2017
    AZ Member #
    399735
    Location
    New Hampshire

    If the ground wire in the harness was burnt, would it be safe to assume that the pin in the bulb tray is burnt too? Maybe you need a new bulb tray. I see you said you swapped from the other side so maybe not. Also, if the ground wire was burnt at the socket connector, I wonder how far back you cut that wire out? It might be burnt further back where you canít see it.

    I would get a hold of the wiring diagram for the tail light and see where the ground for them is. Maybe check the condition of that ground. You could also trace the harness wires to whichever module runs the tail lights. I forget which it is but will be written on the wiring diagram. It could be central electrics or comfort control. Who knows, you might need to run an overlay ground wire from the control module to the tail light. Itís possible that your extra ground didnít cure it because these are Can Bus cars and itís still seeing a break in communication.

    You can download wiring diagrams from ELSA online. Youíll have to register and pay a small fee for 1 day usage. While you are registered, download as many useful things as you can think of 😀

    Erwin.audi.com
    Last edited by EvolutionArmory; 01-18-2019 at 05:17 AM.
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  12. #12
    Veteran Member Four Rings Charles.waite's Avatar
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    Jun 27 2011
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    77478
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    Seattle, WA

    When mine failed, the pin on the bulb holder was melted down to a nub and I had to replace the taillight housing. I forgot to mention that. Just cleaning the contacts wasnít sufficient.
    -CP
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant)
    2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  13. #13
    Established Member Two Rings SlvrArrw's Avatar
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    Nov 05 2016
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    Location
    Richmond, Texas, USA

    Just a note here. My ground bypass is working for me as I stated before, no CEL or other bulb errors. However, I recall that I upgraded my engine compartment grounds . Since we know grounding is an issue with age, that is one thing that may helps us.

    Sent from my SAMSUNG-SM-G935A using Tapatalk

  14. #14
    Registered Member One Ring
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    thanks all wiling to help, went to the mechanic, first thing he was saying is the bypass ground, seeing that i have done that, he changed light bulbs, and quickly turn of and on the ignition key without starting, stating that it restarts the lights control module....

    the bulb was new and working on other lights, but not in the light/brake hole.... i have no idea why....

    well it worked, and it is working fine now...

  15. #15
    Established Member Four Rings
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    May 20 2017
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    399735
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    New Hampshire

    Fucking can bus....🤣🤣🤣
    2005.5 A4 Avant: JHM K04R, GIAC K04 tune, RS4 PRV, RS4 fuel pump controller, Treadstone TR6 intercooler core with JHM pipe kit, CTS Turbo test pipe, ECS Tuning snub mount, 034 street tranny mount, 034 street motor mounts, ECS Tuning turbo inlet pipe, ECS Tuning RA4 clutch conversion, Billy Boat Stealth cat back, Fluidampr

  16. #16
    Established Member Two Rings SlvrArrw's Avatar
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    Nov 05 2016
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    Richmond, Texas, USA



    Sent from my SAMSUNG-SM-G935A using Tapatalk

  17. #17
    Active Member Two Rings Supersquid's Avatar
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    May 23 2014
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    237404
    Location
    Olympia, WA

    I experienced this and feel fortunate. Bukdb


    Sent from my iPhone using Tapatalk
    2005.5 A4 Avant 2.0; Stock

  18. #18
    Active Member Two Rings Supersquid's Avatar
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    May 23 2014
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    Olympia, WA

    Quote Originally Posted by Supersquid View Post
    I experienced this and feel fortunate. Bukdb


    Sent from my iPhone using Tapatalk
    I experienced this and feel fortunate. Bulb started working again once I touched it to remove. That was a few weeks ago and things are good so far. FWIW, the taillight housing isnít sealed very well. That may be added to the list of ďspring items.Ē

    I was also experiencing the brake lights coming on. Figured it was a faulty brake switch (which it may have been) because the brake lights were on all the time.

    I replaced the brake switch with a NAPA part. Donít do that. Get the Audi one. Ask me how I know. Installed the correct AUDI/VW one last week and still had the problem for a couple days. Everythingís been good this week.

    Whoídathunk taillights could be SO troublesome?!



    Sent from my iPhone using Tapatalk
    2005.5 A4 Avant 2.0; Stock



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