Light & Rain Sensor

LIGHT & RAIN SENSOR





Component Function Check
1.CHECK FRONT WIPER AUTO OPERATION
1. Clean light & rain sensor detection area of windshield fully.
2. When the front wiper switch is turned to AUTO position, front wiper operates once regardless of a rainy condition.
Is front wiper (AUTO) operation normally?
YES - Light & rain sensor circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK LIGHT & RAIN SENSOR FUSE
1. Turn the ignition switch OFF.
2. Check that the light & rain sensor 10A fuse (#6) is not fusing.
Is the fuse fusing?
YES - Replace the fuse after repairing the applicable circuit.
NO - GO TO 2.
2.CHECK LIGHT & RAIN SENSOR POWER SUPPLY
1. Disconnect light & rain sensor connector.
2. Check voltage between light & rain sensor harness connector and ground.





Is the measurement value normal?
YES - GO TO 3.
NO - Repair or replace harness.
3.CHECK LIGHT & RAIN SENSOR GROUND CIRCUIT
Check continuity between light & rain sensor harness connector and ground.





Does continuity exist?
YES - GO TO 4.
NO - Repair or replace harness.
4.CHECK LIGHT & RAIN SENSOR SIGNAL
1. Connect light & rain sensor connector.
2. Turn ignition switch ON.
3. Check signal between BCM harness connector and ground with oscilloscope.





Is the measurement value normal?
YES - Replace light & rain sensor.
NO - GO TO 5.
5.CHECK LIGHT & RAIN SENSOR SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector and light & rain sensor connector.
3. Check continuity between BCM harness connector and light & rain sensor harness connector.





Does continuity exist?
YES - GO TO 6.
NO - Repair or replace harness.
6.CHECK LIGHT & RAIN SENSOR SIGNAL CIRCUIT FOR SHORT
Check continuity between BCM harness connector and ground.





Does continuity exist?
YES - Repair or replace harness.
NO - Replace BCM. Service and Repair.