Wipers/Washers System Description - Control/Function
Basic Control/Function
The intelligent controlled wiper system detects the operating angle of the windshield wiper motor in order to recognize the wiping position of the wiper blade assembly. The wiping speed of the windshield wiper motor is controlled according to a target speed map corresponding to the wiping speed (Low or High) to perform wiping speed control. This wiping speed control keeps the wiping speed of the wiper blade assembly at a constant.
Parking Position Operation
During wiper operation, the parking position operation is performed when any of the following conditions are met:
When the vehicle is turned to the OFF (LOCK) mode.
When the wiper/washer switch is turned off.
When the wiper/washer switch is in AUTO position, but the automatic wiper signal is not sent from the automatic lighting/rain sensor.
Break-Away Operation
The intelligent controlled wiper system performs blockage detection during wiper operation and performs obstacle clearance control upon detection. The operation of the obstacle clearance control is in the following: If the wiper motor is detected to have stopped for 200 ms or more continuously while operating at maximum drive, a blockage is detected. Reverse action is used if a blockage is detected outside the reversal limit range. If a blockage is detected inside the reversal limit range, the wiper motor stops operation for 800 ms, then resumes wiping. (Blockage removal action) After blockage removal action is detected (counted) five times within the reversal limit range, the wiper is judged to be in a locked state, and the wiper motor stops. After the wiper motor stops, it restarts when the wiper/washer switch is turned off and on again.
Service Position
Operating Condition
When the wiper is active or stops at any position lower than the upper reversal position, turn and hold the MIST switch, and then turn the vehicle to the OFF (LOCK) mode to stop the wiper blades at the service position.
End Conditions
Vehicle is in the ON mode.
The upper reversing position is recognized.
Rear Window Wiper Control
The body control module performs control according to the wiper switch signal, the back-up light signal, the ATP-R signal, the washer switch signal, and other input data. Wiper and washer linkage or reverse linkage is set.
Automatic Lighting/Rain Sensor Connection Check (With Automatic Wiper)
The body control module spends about a second to check if automatic lighting/rain sensor is connected every time a battery is connected to the body control module. When the body control module does not detect the connection within the time period, the automatic wiper function does not work.