Circuit/System Description

The body control module (BCM) controls the washer motor based on an input from the windshield wiper washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the washer switch is closed, low reference is supplied to the front washer switch signal circuit. When this is seen, the BCM will command the front washer pump and the low speed wipers on. When headlamp wash is equipped, the headlamps shall be sprayed with wash fluid as a result of an extended windshield wash switch activation. In order to preserve wash fluid, the feature shall only be allowed to activate if the low or high beam headlamps are active. In addition, after the initial headlamp wash operation has been performed, additional headlamp washes shall not be performed for the next 4 windshield wash activations or for 48 hours, whichever occurs first.