Ambient Light Sensor: Testing and Inspection

W/ Automatic Light Control System:
INSPECT AUTOMATIC LIGHT CONTROL

a. Turn the ignition switch ON.
b. Turn the light control switch to OFF.
c. Parking brake lever released.
d. Gradually cover the top of the sensor.
e. Verify that the lights should turn ON the accessory lights and the headlights.




W/ Automatic Light Control System:
INSPECT AUTOMATIC LIGHT CONTROL

a. Gradually expose the sensor.
b. Verify that the lights should turn OFF the headlights and the accessory lights.

W/ Automatic Light Control System:
INSPECT LIGHT-OFF CONDITION

a. Turn the ignition switch ON.
b. Gradually cover the top of the sensor. Lights auto ON:

W/ Automatic Light Control System:
INSPECT LIGHTS-ON CONDITION

a. Open the driver's door while the ignition switch is OFF.
b. Turn the light control switch to OFF leaving the door open and cover the top of the sensor, and verify that the lights go on when the ignition switch is turned ON.







W/ Automatic light control system:
INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT
Connector disconnected:
Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in the table.
If circuit is as specified, perform the inspection.
If the circuit is not as specified, inspect the circuit connected to other parts.







INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT
Connector disconnected:
Connect the wire harness side connector to the sensor and inspect wire harness side connector from the back side, as shown.

HINT:
- Ignition switch ON.
- Light control switch OFF.
- Vehicle's surroundings are bright.

If circuit is as specified, try replacing the sensor with a new one.
If the circuit is not as specified, inspect the circuit connected to other parts.