Fog Lights Circuit Description for Chevrolet Monte Carlo 2000

The FOG LAMP relay in the top underhood accessory wiring junction block controls the fog lamps. The coil and switched side of the relay receives B+ at all times from the fog lamp relay fuse. When the fog lamp switch is pressed, a ground is applied to the BCM through the fog lamp switch input circuit. The BCM then applies a ground to the FOG LAMP relay through the fog lamp relay coil control circuit. This energizes the relay, closing the switched contact and applies B+ to the fog lamps turning them on. The fog lamps receive a constant ground.