You can download the RLF at Helpdesk,
it is in german, but there you find the wiring diagrams.
I havent had this issue before.

Gude Mario Audi 100 CD Autom. Bj.83 Audi 200 20v Bj.89 Audi 5000 Bj.85 Audi V8 3,6 Autom. Bj.88