Trailer Hitch Retrofitting (7L)
From Ross-Tech Wiki
Note: Some sections are marked with 7LA (pre-facelift) and 7L6 (facelift), please decide yourself which one you have.
CAN-Gateway (7L6 only)
Trailer Control Module
NOTE: This part varies depending on the type of the trailer control module. There are 2 variants available, those which are diagnostic capable and those who are not.
Variant #1: Trailer Control Module (#69) NOT diagnostic capable
Nothing to do here, so leave it alone.
Variant #2: Trailer Control Module (#69) diagnostic capable
This control module requires a coding, see VAG-COM coding help or vehicle specific coding table for details.
If installed the following modules may need to be recoded/adapted.