Theory Of Operation

The Washer Motor Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM sends Washer Motor Switch commands through the LIN Bus to the Body Control Module (BCM). When the BCM receives a message to activate the Washer Motor, the BCM provides a voltage signal to the Washer Pump Motor, through the Washer Pump Motor Control circuit. A ground path for the Washer Pump Motor is provided through the wiring harness.