Park, Tail, Sidemarker, and Rear License Lamps

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

The front park lamps are made up of the front park/turn signal lamps and the front sidemarker lamps. The rear park lamps are made up of the rear tail/turn signal lamps, rear park lamps, rear sidemarker lamps, and rear license lamps.

The autolamp switch is used to operate all the park lamps and rear license lamps. The autolamp switch is located on the left side of the Instrument Panel Cluster (IPC). Pulling the knob of the autolamp switch out to the middle position will turn ON the park lamps. The park lamps can also be illuminated by the BCM during automatic autolamp operation in low light mode.

When the autolamp switch placed in the PARK position battery voltage is supplied through the autolamp switch to both the TAIL LAMP, LIC LAMPS fuse and the FRONT PARK fuse. Battery voltage is then applied through the TAIL LAMP LIC LAMPS fuse and the FRONT PARK fuse to the front and rear park lamps and the rear license lamps illuminating the lamps. The park lamps and rear license lamps receive ground at all times.

The park lamps can also be controlled by the park lamp relay during automatic autolamp operation in low light mode. Both the coil and the switched sides of the park lamp relay receive battery voltage at all times. When the BCM is in automatic autolamp operation, low light mode, the BCM then applies a ground through the park lamp relay coil control circuit to the park lamp relay. This energizes the relay closing the switch contact and applies battery voltage to both the TAIL LAMP, LIC LAMPS fuse and the FRONT PARK LAMP fuse. Battery voltage is then applied through the TAIL LAMP LIC LAMPS fuse and the FRONT PARK fuse to the front and rear park lamps and the rear license lamps illuminating the lamps. The park lamps and rear license lamps receive ground at all times.