Rear lights won't work

[Javier Neog]

Hi friends

I just can't solve this problem. Rear lights won't turn on, nor break lights, nor yellow (turning) lights. I found out that I had a glass break sensor problem using ODIS software, and that prevented any light from the rear side to turn on, the reason? I really don't know. So, since I bought my Q7 as used and I suppose the glass from the back was once broken an replaced, but not the sensor.

I fixed the sensor issue by following the control module J393, the one cable that goes through the 3 rear window's sensors and found the open circuit, so I grounded the sensor and problem fixed. Now that DTC error for Glass-Break sensors has dissappeared, lights still won't turn on!! I already checked for any error using VCDS and there is nothing shown.

My guess is the following: maybe after a rear glass is broken and replaced, the control module should be programmed somehow to tell the ECU that everything is OK and let the lights work. Bulbs work since I follow the Output Tests and lights work individually. I have no broken fuses, nor broken bulbs, and no DTC errors now.

Any guess? I just ran out of ideas :D

THank you very much!

Javier