RAIN SENSOR FUNCTION

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Rainfall Detection Function

• The LED in the rain sensor emits infrared light which is reflected off the windshield via the lens sensor and then received by the photodiode in the rain sensor. If the rate of reflected infrared light is reduced, it is determined that rain is contacting the windshield and the intensity of the rainfall is calculated from the amount of reflection rate reduction.
• If the rain sensor detects rainfall and then detects no change in the detected amount after the wipers have been operated two times, the windshield is determined to be dirty and windshield wiper operation is stopped.

  ― If the windshield is dirty, turn the wiper and washer switch to the 1 or 2 position to operate the windshield wipers. Or, remove dirt from the windshield before operating the auto wiper.

• When the temperature sensor inside the rain sensor detects approx. -10 °C {14°F} or less when the vehicle speed is 0 km/h {0 mph}, the windshield wipers do not operate.

Sensitivity Adjustment Function

• By changing the sensitivity adjustment volume, installed on the wiper and washer switch, the sensitivity of the rain sensor can be freely adjusted.

Initial Setting Function

• When the ignition switch is turned to the ON position after replacing the rain sensor with a new one, the initial setting is stored after verifying the windshield condition.

  Note
  • The optional rain sensor re-initialization can be performed using the specified procedure.
    ― For the re-initialization method, refer to the Workshop Manual. (See CX-9 Workshop Manual.)

On-board Diagnostic Function

• If there is any malfunction in the rain sensor, the auto light/wiper control module is informed of the malfunction and a DTC is detected.