Removal Procedure

WARNING: This page is about a different car, the 2020 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

Quarter Lower Rear Trim Panel Right Side (1) - Remove - Quarter Lower Rear Trim Panel Replacement (Right Side) , and Quarter Lower Rear Trim Panel Replacement (Left Side)
Disconnect the trailer lamp control module electrical connector.
Courtesy of GENERAL MOTORS COMPANY

Trailer Lamp Control Module Nut (1) - Remove [2x]
Courtesy of GENERAL MOTORS COMPANY

Trailer Lamp Control Module (1) - Remove