AUTO WIPER SYSTEM OPERATION

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1.  The rain sensor installed in the windshield detects rainfall amount when the wiper and washer switch is turned to the AUTO position.

2.  The detected rainfall amount is converted to an electronic signal and transmitted to the auto light/wiper control module as a windshield wiper operation control signal.

3.  When the microcomputer in the auto light/wiper control module receives the control signal, the wiper relay turns on.

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

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

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Intermittent Operation

•  If the windshield wipers are stopped and the rain sensor detects a specified amount of rainfall, the wipers are operated at low speed. The interval timing is adjusted according to the amount of rainfall detected.

Low Speed Operation

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

High Speed Operation

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

Fail-safe Function

•  When a rain sensor malfunction or a communication error between the rain sensor and auto light/wiper control module is detected, the auto light/wiper control module initiates controls as indicated in the fail safe function table.

Fail-safe Function Table

Malfunctions
Fail-safe function
Recovery items
Before operation
After operation
•  Rain sensor error
•  Rain sensor communication error
High speed operation
Maintains high speed operation
•  Switch the ignition OFF
•  When a rain sensor malfunction is cleared
•  When communication is restored
•  When the wiper and washer switch is in a position other than AUTO
Low speed operation
Maintains low speed operation
Intermittent operation
Intermittent operation according to the sensitivity setting
Off
Maintains turn-off