Ambient Light Sensor: Testing and Inspection

Optical Sensor Circuit Check

Description

The optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal to the BCM.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Auto Light System: Wiring Diagram] Auto Light System.

1. CHECK OPTICAL SENSOR GROUND CIRCUIT

1 Turn the ignition switch OFF.
2 Disconnect BCM connector M18 and optical sensor connector M145.
3 Check continuity between BCM harness connector and optical sensor harness connector.






4 Check continuity between BCM harness connector and ground.






Are continuity results as specified?
YES
GO TO 2
NO
Repair harness or connector.

2. CHECK OPTICAL SENSOR SIGNAL CIRCUIT

1 Check continuity between BCM harness connector and optical sensor harness connector.






2 Check continuity between BCM harness connector and ground.






Are the continuity results as specified?
YES
Replace the optical sensor. Refer to [Optical Sensor: Removal and Installation] Service and Repair.
NO
Repair harness or connector.