Rain Sensor: Testing and Inspection

RAIN SENSOR





Component Function Check
1.CHECK FRONT WIPER AUTO OPERATION
1. Clean 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 - Rain sensor circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK FUSE
1. Turn the ignition switch OFF.
2. Check 10A fuse, [No.6, located in fuse block (J/B)].
Is the inspection result normal?
YES - GO TO 2.
NO - Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK RAIN SENSOR POWER SUPPLY
1. Disconnect rain sensor connector.
2. Check voltage between rain sensor harness connector and ground.





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





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness.
4.CHECK RAIN SENSOR SIGNAL
1. Connect rain sensor connector.
2. Turn ignition switch ON.
3. Check signal between BCM harness connector and ground using oscilloscope.





Is the inspection result normal?
YES - Replace rain sensor.
NO - GO TO 5.
5.CHECK RAIN SENSOR SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and rain sensor connector.
3. Check continuity between BCM harness connector and rain sensor harness connector.





4. Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES - Replace BCM. Service and Repair.
NO - Repair or replace harness.