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- Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK RAIN SENSOR FUSE

1.Turn ignition switch OFF.
2.Check that the following fuse is not fusing.





Is the inspection result normal?
YES- GO TO 2.
NO- Replace the fuse after repairing the applicable circuit.

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 with oscilloscope.





Is the inspection result normal?
YES- Replace rain sensor.
NO- GO TO 5.

5. CHECK RAIN SENSOR SIGNAL CIRCUIT FOR OPEN

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.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace harness.

6. CHECK RAIN SENSOR SIGNAL CIRCUIT FOR SHORT

Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES- Replace BCM. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace harness.