Ambient Light Sensor: Testing and Inspection

OPTICAL SENSOR





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




Component Function Check
1.CHECK OPTICAL SENSOR SIGNAL BY CONSULT-III
CONSULT-III
1. Turn the ignition switch ON.
2. Select "OPTICAL SENSOR" of BCM (HEAD LAMP) DATA MONITOR item.
3. Turn the lighting switch to AUTO.
4. With the optical sensor illuminating, check the monitor status.





Is the item status normal?
YES - Optical sensor is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, Auto Light System.
1.CHECK OPTICAL SENSOR POWER SUPPLY INPUT
1. Turn the ignition switch ON.
2. Turn the lighting switch to AUTO.





3. Check the voltage between the optical sensor harness connector and ground.





Is the measurement value normal?
YES - GO TO 2
NO - GO TO 4
2.CHECK OPTICAL SENSOR GROUND INPUT





Check the voltage between the optical sensor harness connector and ground.





Is the measurement value normal?
YES - GO TO 3
NO - GO TO 6
3.CHECK OPTICAL SENSOR SIGNAL OUTPUT





With the optical sensor illuminating, check voltage between the optical sensor harness connector and ground.





Is the measurement value normal?
YES - GO TO 7
NO - Replace the optical sensor.
4.CHECK OPTICAL SENSOR POWER SUPPLY FOR OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the optical sensor connector and BCM connector M18.





3. Check continuity between the optical sensor harness connector
(A) and the BCM harness connector (B).





Does continuity exist?
YES - GO TO 5
NO - Repair the harnesses or connectors.
5.CHECK OPTICAL SENSOR POWER SUPPLY FOR SHORT CIRCUIT





Check the continuity between the optical sensor harness connector and the ground.





Does continuity exist?
YES - Repair the harnesses or connectors.
NO - Replace BCM. Service and Repair.
6.CHECK OPTICAL SENSOR GROUND FOR OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the optical sensor connector and BCM connector M18.





3. Check continuity between the optical sensor harness connector
(A) and the BCM harness connector (B).





Does continuity exist?
YES - Replace BCM. Service and Repair .
NO - Repair the harnesses or connectors.
7.CHECK OPTICAL SENSOR SIGNAL FOR OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the optical sensor connector and BCM connector M18.





3. Check continuity between the optical sensor harness connector
(A) and the BCM harness connector (B).





Does continuity exist?
YES - GO TO 8
NO - Repair the harnesses or connectors.
8.CHECK OPTICAL SENSOR SIGNAL FOR SHORT CIRCUIT





Check the continuity between the optical sensor harness connector and the ground.





Does continuity exist?
YES - Repair the harnesses or connectors.
NO - Replace BCM. Service and Repair .