RAIN SENSOR CONSTRUCTION OPERATION

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Warning

• The windshield wipers could operate automatically if servicing such as vehicle washing is performed with the ignition switch in the ON position and the wiper and washer switch in the AUTO position. Always turn the ignition switch, and the wiper and washer switch off before doing servicing such as vehicle washing. Otherwise a pinched hand or fingers could result in injury, or the wiper system could malfunction.

Caution

• In the following cases, the rain sensor cannot detect the rainfall amount correctly, which could result in a windshield wiper malfunction.

― A sticker or label is adhered to the windshield above the rain sensor.

― The windshield is dirty above the rain sensor.

• The rain sensor is installed to the lens in the center of windshield on the upper side.

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• The rain sensor is integrated with the auto-light sensor.

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Operation With No Rainfall Contacting Windshield

1. Infrared light is emitted from the LED in the rain sensor towards the windshield.

2. The emitted infrared light passes through the lens and is reflected off the windshield.

3. The infrared light reflected off the windshield is received by the photodiode in the lens.

4. The photodiode receives the light, the microcomputer in the rain sensor calculates the rainfall amount from the reflection rate, converts this to an electric signal and sends a windshield wiper control signal to the body control module (BCM).

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Operation with Rainfall Contacting Windshield

1. Infrared light is emitted from the LED in the rain sensor towards the windshield.

2. Emitted infrared light passing through the lens is received by the windshield and transmitted to the rainfall contacting the windshield.

3. The infrared light that is not diffused is reflected by the windshield and received by the photodiode in the lens sensor.

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