Head Lamps

Battery voltage is applied contentiously to the headlamps through two fuse. The HDLP L fuse for the left side headlamp and the HDLP R fuse for the right side headlamp. When the headlamp switch is turned to the HEAD position, ground is applied through the headlamp switch to the BCM using the headlamp switch output circuit. When the BCM receives the headlamp switch output signal, it applies a ground to the headlamp relay coil control circuit. When a ground is applied to the headlamp relay coil control circuit this engages the headlamp relay, closing the switch contacts and applies a ground through the headlamp relay to the headlamp relay contact circuit to the headlamp dimmer switch. Depending on the headlamp dimmer switch position the ground circuit would then be applied to either the high beam headlamps or the low beam headlamp turning them on.