Removal Procedure

Remove the fasteners (1) at the rear edge of the insulators.
Push in on the snap tab retainers in order to release the insulator.

Fig 1: Removing Fasteners At Insulator Rear edge (RHD - Left)
Courtesy of GENERAL MOTORS CORP.
Disconnect the electrical connectors (1, 2) as necessary.

Fig 2: Disconnecting Electrical Connectors (RHD - Left)
Courtesy of GENERAL MOTORS CORP.
Slide the insulator (3) rearward toward the vehicle.