The rear wiper/washer system consists of the following components:

The rear wiper motor module is part of the rear wiper motor assembly and controls wiper motor operation. Battery voltage supplied to the wiper motor assembly is used to operate the wiper motor in all modes and to return the rear wiper arm to the park position after the wiper switch is turned off. Accessory voltage supplied to the rear wiper/washer switch is used to supply the rear wiper switch signal circuits and the rear washer pump. In the LO position, the wiper switch supplies voltage through an internal resistor on the signal circuit to the wiper motor module. In the HI position, the wiper switch supplies voltage on the signal circuit to the wiper motor module. The rear washer control circuit is used to provide the operating voltage for the rear washer pump for as long as the rear washer switch is pressed. The rear washer control circuit is also used as a wash signal to the rear wiper motor module.

The liftglass ajar jamb switch will disable the rear wiper when the liftglass is open. The wiper switch supplies voltage through the closed contacts of the liftglass ajar jamb switch on the signal circuit to the wiper motor module. When the liftglass is open, the contacts of the liftglass ajar jamb switch are open which prevents the voltage on the signal circuit of the rear wiper/washer switch from reaching the wiper motor module.