RAIN SENSOR CONSTRUCTION OPERATION


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Construction

•  The rain sensor is installed to the bracket in the upper center part of the windshield.
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•  The rain sensor is integrated with the auto-light sensor.
•  The rain sensor consists of the lens, LED, photodiode, and CPU, and sends/receives signals between the BCM using serial communication.
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Operation


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 reflect off the windshield.

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

4.  When the photodiode receives the light, the microcomputer in the rain sensor calculates the rainfall amount from the reflection rate, and sends a windshield wiper control signal to the 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 goes through the windshield and penetrate rainfall on the windshield.

3.  The infrared light which cannot penetrate is reflected off the windshield and is received by the photodiode in the rain sensor.

4.  When 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 BCM.

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