Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Remove the left sound insulator. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- LEFT in Instrument Panel, Gages and Console.
Rotate the stop lamp/ABS/shift lock switch (2) counterclockwise, then pull to remove the switch.
Disconnect the electrical connector from the switch.

Fig 1: Removing Stop Lamp Switch
Courtesy of GENERAL MOTORS CORP.