AUTO WIPER SYSTEM

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Outline

•  The auto wiper system performs windshield wiper operation and stopping according to the rainfall amount on the windshield glass.
•  Equipped with intermittent, and continuous low and high operation.

Function

•  The BCM controls the windshield wipers based on the windshield wiper operation signal from the rain sensor.
―  Intermittent operation control
•  When the rain sensor detects the amount of rainfall, the windshield wipers are operated once at low speed.
•  The intermittent operation of the windshield wipers is switched at 5 levels according to the amount of rainfall detected by the rain sensor.
―  Continuous low speed operation control
•  When the rain sensor detects an amount of rainfall greater than the amount required for intermittent operation control, the windshield wipers are operated continuously at low speed.
―  High speed operation control
•  When the vehicle speed is 4 km/h {2 mph} or more and the rain sensor detects an amount of rainfall greater than the amount required for continuous low speed operation control, the windshield wipers are operated twice at high speed. Afterwards, if the rain sensor detects the necessary amount of rainfall for high speed operation, the windshield wipers are operated continuously at high speed.
•  When the vehicle speed is 4 km/h {2 mph} or less and the rain sensor detects an amount of rainfall greater than the amount required for continuous low speed operation, the windshield wipers are operated continuously at low speed.
―  Sensitivity adjustment function
•  The sensitivity adjustment function can be used to adjust the rain sensor rain detection sensitivity by operating of the wiper and washer switch sensitivity adjustment volume.
•  When the windshield wipers are stopped during an interval and the sensitivity adjustment volume is operated in the direction of high sensitivity, the windshield wipers operate one time to notify the driver that the rain detection sensitivity has been changed.

Personalization function

•  A personalization feature has been adopted with which settings for the auto wiper system can be changed.
•  When the auto wiper system is set to [Off (Intermittent)] or [Off] and the windshield wiper switch is in the AUTO position, the windshield wipers operate intermittently.
•  For details on the personalization features, refer to the [PERSONALIZATION FEATURES] in the workshop manual.


Structure/Construction


System structure

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System wiring diagram

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Operation

Warning
•  If servicing such as vehicle washing is performed with the ignition switched ON (engine off or on) and the windshield wiper switch is in the AUTO position, the windshield wipers may operate automatically and your finger or hand could be pinched, leading to an injury or wiper system malfunction. Always switch the ignition off or turn the windshield wiper switch to the OFF position before servicing.

Intermittent operation/Continuous low speed operation

1.  When the windshield wiper switch is in the AUTO position (1) with the ignition switched ON (engine off or on), the instrument cluster detects (2) a windshield wiper switch AUTO signal.

2.  When the instrument cluster detects the windshield wiper switch AUTO signal, it sends (3) a windshield wiper AUTO operation request signal and AUTO volume signal to the body control module (BCM) via CAN communication.

3.  The body control module (BCM) sends (4) the windshield wiper AUTO operation request signal and AUTO volume signal, and the vehicle speed signal sent from the PCM to the rain sensor via LIN communication.

4.  When the rain sensor receives the windshield wiper AUTO operation request signal, it detects (5) the amount of rainfall.

5.  The rain sensor determines the operation interval of the windshield wipers based on the detected rainfall amount and the signal from the body control module (BCM), and sends (6) a windshield wiper LO operation request signal to the body control module (BCM).

6.  When the body control module (BCM) receives the windshield wiper LO operation request signal, it sends (7) the signal to the windshield wiper motor via LIN communication.

7.  When the windshield wiper motor receives the windshield wiper LO operation request signal, it operates (8) the windshield wipers intermittently or continuously at low speed.

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High speed operation

1.  When the windshield wiper switch is in the AUTO position (1) with the ignition switched ON (engine off or on), the instrument cluster detects (2) a windshield wiper switch AUTO signal.

2.  When the instrument cluster detects the windshield wiper switch AUTO signal, it sends (3) a windshield wiper AUTO operation request signal and AUTO volume signal to the body control module (BCM) via CAN communication.

3.  The body control module (BCM) sends (4) the windshield wiper AUTO operation request signal and AUTO volume signal, and the vehicle speed signal sent from the PCM to the rain sensor via LIN communication.

4.  When the rain sensor receives the windshield wiper AUTO operation request signal, it detects (5) the amount of rainfall.

5.  The rain sensor determines the operation interval of the windshield wipers based on the detected rainfall amount and the signal from the body control module (BCM), and sends (6) a windshield wiper HI operation request signal to the body control module (BCM).

6.  When the body control module (BCM) receives the windshield wiper HI operation request signal, it sends (7) the signal to the windshield wiper motor via LIN communication.

7.  When the windshield wiper motor receives the windshield wiper HI operation request signal, it operates the windshield wipers at high speed.

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