AUTO WIPER SYSTEM OPERATION

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1.  When the wiper and washer switch is turned from the OFF to AUTO position, the windshield wiper operates once at low speed and the rain sensor installed in the windshield detects the rainfall amount.

2.  The detected rainfall amount is converted to an electronic signal and transmitted to the body control module (BCM) as a windshield wiper operation control signal.

3.  When the microcomputer in the BCM receives the control signal, current flows to the transistor and the transistor is turned on.

4.  When the transistor turns on, the windshield wiper relay turns on.

5.  When the windshield wiper relay turns on, current flows to the windshield wiper motor and the wipers operate at low speed.

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Intermittent Operation

Low Speed Operation

•  If the rain sensor detects an amount of rainfall specific to wiper operation greater than low speed, but less than high speed while the windshield wipers are operating intermittently, the wipers operate continuously at low speed.

High Speed Operation

•  If the rain sensor detects an amount of rainfall specific to high speed operation or greater while the windshield wipers are operating at low speed or stopped, the wipers operate two times at high speed. If the rain sensor receives a signal for high speed operation after the wipers operate two times at high speed, the high speed operation is continued.