Wipers and Washers - System Operation and Component Description

are deactivated (moisture no longer detected on the windshield), the BCM turns the exterior lamps off after a time delay.

Component Description

Wiper/Washer Switch

The wiper/washer switch is mounted directly to the SCCM. The windshield wiper/washer inputs to the SCCM are:

Mist wipe Windshield wash Off AUTO 1/INT 1 AUTO 2/INT 2 AUTO 3/INT 3 AUTO 4/INT 4 AUTO 5/INT 5 AUTO 6/INT 6 Low High

Windshield Wiper Motor

The windshield wiper motor contains a logic module, internal sensors to monitor the wiper arm position, and a multi-speed motor. The logic module from the windshield wiper motor continuously monitors the wiper/washer switch inputs from the SCCM and the rain sensor when the ignition is on. Depending on the input, the wiper motor activates to achieve the desired request.

The windshield wiper motor is mounted to the wiper and linkage assembly.

Washer Pump

The washer pump is controlled by the windshield wiper motor. The washer pump delivers washer solvent to the windshield when the windshield wiper motor activates the windshield washer relay (internal to the windshield wiper motor), which provides voltage to the washer pump. When activated, the washer pump delivers washer solvent to the windshield.

Rain Sensor

The rain sensor uses an infrared beam to optically sense moisture on the windshield. The intensity of the reflected beam is measured and compared to the intensity of the transmitted beam. If there is water on the surface of the windshield the beam distorts, reducing the intensity of the beam. If the beam is not reflected completely, it is interpreted as rain on the windshield and the windshield wipers are activated.

A gel-type lens is used as the interface between the rain sensor and the windshield. If the lens is missing or damaged, the rain sensing wipers can be inoperative. The rain sensor gel-type lens cannot be replaced separately on a rain sensor of this type.

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