Mazda CX-9 2007 Service Highlights page 509

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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 rain sensor.

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 auto light/

wiper control module.

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 diffused by 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 rain

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 auto light/

wiper control module.

NG: WASHER FLUID-LEVEL SENSOR

WIPER/WASHER SYSTEM

INFRARED LIGHT

INFRARED LIGHT

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