Normal Operation

The front wiper relay (located in the Battery Junction Box (BJB)) is activated whenever the ignition is in the ON position. The front wiper relay provides power to the windshield wiper motor. The multifunction switch is mounted to the Steering Column Control Module (SCCM). The SCCM commands the windshield wiper motor to activate the appropriate wash, low, high and intermittent modes through a private Local Interconnect Network (LIN).

When the multifunction switch is in the HIGH position, the windshield wiper motor also receives a ground signal which is hardwired directly through the SCCM (bypassing the logic within the module). This fail-safe circuit makes sure that the windshield wipers function in HIGH speed mode in the event of a LIN communication failure.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Multifunction switch
• Windshield wiper motor
• SCCM