Trailer Hitch Control Module

Description and Operation
- Trailer Module (AHM Trailer Module or AHM3+ Trailer Module With Boosted Power or AHM4 Trailer Module 4)
- Lighting
  - Trailer Module and Trailer Coupling Release, Functional Description
  - Supply, AHM Trailer Module
Testing and Inspection
- General Vehicle Electrical System
  - Trailer Module: Currently Known Fault Patterns
  - Power Supply, Footwell Module FRM
- Lighting
Service and Repair
- Removing and Installing/Replacing Trailer Module
- 61 35 502 Replacing Trailer Module (09/2006-03/2009)