Headlamp Washer System Components
The headlamp washer system consists of the following components:
• | Washer fluid level switch |
• | HDLP WASH 30A circuit breaker |
Headlamp Washer System Controls
The headlamp washer system is controlled by the following components:
• | Body control module (BCM) |
• | Washer fluid level switch |
• | Windshield wiper/washer switch |
Headlamp Washer System Operation
Battery voltage is supplied to the headlamp washer relay switched input. The windshield washer pump control circuit is spliced to the headlamp washer relay. When the windshield washer switch is pressed, battery voltage is supplied on washer switch signal
circuit to the headlamp washer relay which energizes the relay. This allows battery voltage from the headlamp washer relay switched input to relay switched output to supply voltage circuit of the headlamp washer pump. The windshield washer fluid level switch
also provides a signal circuit to the headlamp washer relay and does not allow the relay to be energized when the fluid level is insufficient for pump operation. The body control module (BCM) controls the ground of the headlamp washer relay and the headlamps
must be on for the relay to receive ground and operate. On the early production vehicles, the headlamp washers activate with each windshield washer cycle on the domestic vehicles and after every 3 windshield washer cycles on the exports. For later production
vehicles, all headlamp washer systems activate after every 5 windshield washer cycles.