Rear Wiper/Washer System

REAR WIPER/WASHER SYSTEM DESCRIPTION AND OPERATION

REAR WIPER/WASHER SYSTEM COMPONENTS
The rear wiper/washer system consists of the following components:
- Rear window wiper motor
- Rear window washer fluid pump
- Rear wash relay
- Rear window wiper/washer switch
- RR wiper 15A circuit breaker
- WASH 20A fuse

REAR WIPER/WASHER SYSTEM CONTROLS
- Body control module (BCM)
- Liftgate control module (LGM)
- Rear wiper/washer switch

REAR WIPER/WASHER SYSTEM OPERATION
The rear window wiper/washer switch is an input to the BCM. The requested rear wiper mode is sent to the liftgate control module (LGM) by the BCM as a message on the serial data circuit, and the rear window wiper motor is controlled by the LGM. The switch power circuit to the rear wiper/washer switch is a 12-volt reference supplied by the BCM. The rear wiper/washer switch is a series of resistors and the switch position is determined by the voltage of the rear wiper/washer switch signal circuit to the BCM. The rear wiper/washer switch has continuity at all times and the BCM expects a rear wiper/washer switch signal voltage in all switch positions including OFF. The rear wiper motor is supplied battery positive voltage and ground. The LGM controls rear wiper motor operation through the rear wiper motor control circuit. The rear wiper motor control circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the LGM. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode. The liftglass and liftgate ajar switches are inputs to the LGM and rear wiper motor operation will be disabled whenever an ajar condition exists. The rear window washer pump is controlled by the BCM through the rear washer relay. Battery positive voltage is supplied to the coil and switch sides of the rear washer relay. When the rear window wash request is active the BCM energizes the relay by grounding the relay coil through the rear washer relay control circuit. When the relay is energized battery positive voltage to the relay switch is supplied to the washer pump control circuit.