System Operation

The headlamp washer pump is controlled by the headlamp washer module, which is attached to the wiring harness behind the right headlamp assembly. Battery positive voltage is supplied to the module and is used to power the headlamp washer pump when the relay coil within the washer module is energized. The dash integration module controls the low side of the relay coil and the headlamps must be on for the relay to be energized. The windshield washer pump control circuit is spliced to the headlamp washer module and is used as a washer switch signal circuit. The headlamp washer fluid level switch and the windshield washer fluid level switch provide a signal circuit to the headlamp washer module and do not allow the relay to be energized when the fluid level in either of the washer fluid reservoirs is low.