Stop Lamps
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The STOP LAMP fuse in the fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the turn signal switch and to the center high mounted stop lamp (CHMSL). The turn signal switch applies voltage to the left and right stop lamp assemblies through the turn lamp circuit. The stop lamp along with the CHMSL are grounded at G302.