Removal Procedure

Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection (KL9)
Raise and support the vehicle. Lifting and Jacking the Vehicle
Courtesy of GENERAL MOTORS COMPANY

Electrical Connector (1) @ Trailer Lamp Control Module - Disconnect
Courtesy of GENERAL MOTORS COMPANY

Trailer Lamp Control Module Bracket Nut (1) - Remove [ 2x ]
Trailer Lamp Control Module (2) - Remove