Normal Operation

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

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

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• Wiper relay
• Multifunction switch
• Wiper motor
• SCCM