Audi A6 Rear Door Handle - Replacement

Hello there,
'I'm having a problem with my Audi A6 Avant 2.5 TDI, manufactured in 1999. The interior light in one of the rear doors isn't working, and the car's information system (FIS) doesn't register that the door is open. I've already removed the door panel and checked the microswitch, but that didn't solve the issue. Does anyone have any suggestions or the wiring diagram that I can use to continue troubleshooting?'
Best regards, Marr.

Have you taken a look at the connector for the B-pillar?

Bye.
peace

I checked the connectors to the door, but I didn't have any luck. Could someone tell me the exact pinout of the connectors so I can try measuring something?

'Marr' translates to 'angry' or 'annoyed' in English.

Hello,

I once struggled with a similar problem on my Passat: https://community.dieselschrauber.org/en/viewtopic.php?t=15362&highlight=t%FCrsteuerger%E4t

A6 models and Passats from these production years should be at least similar, but my experience is based solely on the Passat. Nevertheless, the following steps are likely applicable:
* B-pillar connector - clean the contacts, check the cables for possible breaks (have you already done this?).
* Inspect the connectors at the door control unit.
* Door lock: disassemble and check the microswitches, inspect solder joints and circuit traces, measure the switch, measure the connection pins (you've already done some of this).
* Locate and expose the comfort control unit and check the connectors (this is located under the driver's seat in the Passat and is often damaged in cases of water ingress).
"If everything remains normal (i.e., no issues are found), the TSG (presumably a device) may be temporarily connected to the other door to see if the problem lies more in the control units or in the cable/connector pathway between them."

A diagnostic tool would likely be helpful to actually see the switch position as recognized by the control unit.
Unfortunately, I can't provide you with a wiring diagram for the A6.

Bye.
peace