Headlamps Operation

Battery positive voltage (B+) is supplied to the lamp control module (LCM)
through the RH rear junction block HDLP circuit breaker via CKT 1740 at all times. The circuit breaker will open if the headlight circuit draws too much current. When the circuit breaker opens, it interrupts the current flow. With no current flow, the circuit breaker cools and resets automatically. With the headlamp switch in the ON position, battery positive voltage (B+) is supplied through the headlamp dimmer switch to the LH and RH low beam headlamps. High beam operation is enabled by pulling the multi-function lever (turn signal) towards the driver. Battery positive voltage (B+) is then supplied from the LCM through the headlamp dimmer switch to the LH and RH high beam headlamps.