Headlights Circuit

Voltage is available at all times to the headlamp switch from the LIGHTING fuse through CKT 42 (RED). Within the headlamp switch is a 17 A circuit breaker. The circuit breaker resets automatically. The circuit breaker opens upon heating due to an overcurrent condition. The following actions occur when the current breaker is open:
- The current stops.
- The circuit breaker's thermal element cools. The circuit breaker recloses when the circuit breaker's thermal element is sufficiently cool.

The headlamp selector switch has the following positions:
- The OFF position
- The parking lamps position
- The headlamps position

When the switch is in the headlamps position, voltage is available on CKT 10 (YEL) to the headlamp dimmer switch. The headlamp dimmer switch is part of the multi-function switch on the steering column. The switch changes selections when the multi-function switch lever is pulled up along the axis of the steering column. Repeated switch operations alternates between the following selections:
- High beam
- Low beam

When the low beams are selected, voltage is available on CKT 12 (TAN) to the LH/RH HDLP fuses, then to the headlamps. Because the headlamps are grounded, current flows through the low beam filaments and light is emitted. When the high beams are selected, voltage is available on CKT 11 (LT GRN) to the LH/RH HIBM fuses, then to the headlamps. CKT 11 (LT GRN) also supplies the high beam indicator lamp in the instrument cluster. The left headlamp is grounded by CKT 150 (BLK) to ground G108. The right headlamp is grounded by CKT 151 (BLK/WHT) to ground G109.