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Thread: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK

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  1. A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
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    Hi All,

    Recently (about a week ago) I started getting random broken reverse light bulb warnings after startup in my B7 2.0 TDI Avant. Sometimes it shows the left bulb is broken, sometimes the right one. Most often the warning disappears after 3-4 seconds, but sometimes it stays until an igniton cycle. It doesn't happen on every start, it's completely random when it would come up. Today it came up again and I told my brother to check if the lights light up when I switch into reverse. As soon as I shifted to R, the warning disappeared from the display and both reverse lights came on. I searched around in Google and in the forums but couldn't find anyone with exact same symptoms as me. I was thinking reverse light switch first but I think that would just simply cause no reverse lights at all. I didn't touch anything regarding the tail lights, it started out of the blue.

    Has anyone experienced similar?

    Thanks,
    Dan
     
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  2. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
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    Change the bulbs anyway, check the wiring loom, and the connector blocks on the light units themselves.

    Ian
    A4 B6 Avant Nogaro Blue
     
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  3. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
    #3
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    Quote Originally Posted by rowdy-999 View Post
    Change the bulbs anyway, check the wiring loom, and the connector blocks on the light units themselves.
    2nd that.
    I had similar and turned out to be corroded 4th pin.
    search for my solved thread labelled A4 B7 Rear light cluster bad earth for the fix that worked for me
    Car: 2007 Audi A4 Avant B7 2.0 Tdi (BRE) 140 103kW, 170k miles; Mods: none, just new EGR and new Battery; Use: 97mile daily commute and all round family car
     
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  4. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
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    Yeah turns out it was similar for me. Took both units apart and pin 1 (brown) was very oxidized on both sides. Scraped it off and gave it some WD-40. It fixed it on the left side but it came back on the right side after a few days. I took the right side apart again today and this time I could clearly see burn marks on the pin. The issue seems to be with the connector, it is likely oxidized on the inside too, because the end of the wires have that white oxide stuff on them too. I gave it another whiff of WD-40 and put it together.

    I'm gonna order 2 of these from eBay as a permanent solution: link.

    Thanks for the input!
     
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  5. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
    #5
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    Glad to be of help. My bodge is still working for me.
    Come back on here and let us know how easy it was to replace the connectors.
    Car: 2007 Audi A4 Avant B7 2.0 Tdi (BRE) 140 103kW, 170k miles; Mods: none, just new EGR and new Battery; Use: 97mile daily commute and all round family car
     
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  6. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
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    I will definitely do when it arrives
     
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  7. Re: A4 B7 intermittent reverse light bulb warning on both sides, but bulbs are OK 
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    The connectors have arrived today. They look fairly decent:

    20180516_185946.jpg

    I will install them as soon as this horrible weather is gone

    They cost 11.49 with shipping.
    2005 Audi A4
    2.0 TDI BLB (converted to gear drive) 140 HP
    Multitronic
     
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