Rear Wiper/Washer System
The vehicle operator initiates all rear wiper and washer system functions with the control sleeve (3) on the control stalk (1) of the right multi-function switch that extends from the right side of the steering column, just below the steering wheel. Rotating the control sleeve on the control stalk to the various detent and momentary positions selects the rear wiper and washer system operating modes. The right multi-function switch provides resistor multiplexed inputs to the left multi-function switch, the left switch then sends a message over the Local interconnect Network (LIN) data bus to the CCN, and then the CCN sends a bus message over the CAN data bus to the TIPM for all of the rear wiper and washer system functions.
The TIPM provides battery voltage and ground to operate the washer pump/motor unit and a control output to the rear wiper relay, which provides battery voltage to operate the rear wiper module. Rear wiper/washer system operation is completely controlled by the TIPM logic circuits, and that logic will only allow these systems to operate when the ignition switch is in the Accessory or On positions.
The most reliable, efficient, and accurate means to diagnose the right multi-function switch or the TIPM inputs and outputs related to the various rear wiper and washer system operating modes requires the use of a diagnostic scan tool and the appropriate diagnostic information.