LaCrosse V6-3.8L VIN 2 (2005)
Brake Lamp: Description and Operation
STOP LAMPS
The rear turn signal lamps are also used as the stop lamps. The TURN/HAZ fuse in the instrument panel (I/P) fuse block supplies battery positive voltage
to the body control module (BCM) for the turn signal/stop lamps and hazard lamps. The CHMSL/BKUP fuse in the I/P fuse block provides battery
positive voltage to the center high mounted stop lamp (CHMSL). The brake pedal position sensor receives a low reference signal and a 10-voltreference
signal from the BCM. Whenever the brake pedal is applied, the brake pedal position sensor applies a variable voltage signal to the BCM through the stop
lamp switch signal circuit. The BCM then applies battery positive voltage to the rear turn/stop lamps and to the CHMSL, illuminating them. The left rear
turn lamp is grounded at G301 and the right rear stop/turn lamp and CHMSL is grounded at G302.
