Windshield Washer Switch: Testing and Inspection

The complexity of the electronics involved with the various electronic control modules and the multiplexed communication networks, preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU User Guide for detailed instructions on testing the multifunction switch circuit.

The PDU systematically tests and analyses all functions of the multifunction switch.

Where a fault involving the multifunction switch is indicated by the PDU, before installing new components, some basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged.