Interior Monitoring Audi A6 C5: Installation & Wiring

Translated on 05-08-2026, 4:55.

Hi,
I'm currently installing a parking heater in my Audi A6 from 1999, but I'm having trouble with the wiring for the interior monitoring system. I have a limited instruction manual from Webasto (for models from 1998 onwards) and a generally better one from Audi (for A6 models after the facelift), but I can't find the connectors and pins that are mentioned there (and which differ!). There seems to be only a coupling station on the right B-pillar, not the control unit.
Can anyone help me with information related to my year of construction? Erwin is asking for 107 euros...

Translated on 05-08-2026, 4:56.

You have email...

Translated on 05-08-2026, 4:56.

It helped me.
From the control unit located between the left rear seat belt and the airbag, contact pins 4 and 14 (which are the same) connect to a two-pin (4mm) connector on the A-pillar coupling station. The colors are as follows: pin 14 is black/green, and pin 4 is brown/green.
Thank you again!