Trailer Hitch Socket Connector Assignment

Fig 1: Identifying Trailer Hitch Wiring Socket, Multi-Pin Connector Assignments

Courtesy of AUDI OF AMERICA, LLC

13-pin Trailer Hitch Socket (Country Version) 

1. Terminal BL (Left turn signal) 
2. Terminal NSL (Rear fog lamp) 
3. Terminal 31, Ground (GND) 
4. Terminal BR (Right turn signal) 
5. Terminal 58 R (Right tail lamp) 
6. Terminal 54 (Brake light) 
7. Terminal 58 L (Left tail lamp) 
8. Terminal RF (Back-up light) 
9. Refer to Wiring Information 
10. Refer to Wiring Information 
11. Refer to Wiring Information 
12. Refer to Wiring Information 
13. Refer to Wiring Information 

Socket with Rear Fog Lamp Shut-Off Contact Switch -F216-

Connector assignment on Rear fog lamp shut-off contact switch.