Audi Workshop Service and Repair Manuals

T1a  -  single, behind dashboard (connection for heated back seats)
T1b  -  single, behind dashboard
T3 

-  3 point, under driver's seat

T3a  -  3 point, under passenger seat
T3b  -  3 point, behind dashboard
T3c  -  3 point, behind dashboard
T37  -  37 point, wire distributor

Ground Connector 

8 

-  behind dashboard

13 

-  wiring harness, dashboard