Ambient Light Sensor: Testing and Inspection

AUTO ON: INSPECT AUTOMATIC LIGHT CONTROL
a. Turn the ignition switch ON.
b. Turn the light control switch to AUTO.
c. Gradually cover the top of the sensor.
d. Check the accessory lights and the headlights come on.




AUTO OFF: INSPECT AUTOMATIC LIGHT CONTROL
a. Gradually expose the sensor.
b. Check the headlights and the accessory lights should turn OFF.

INSPECT LIGHT-OFF CONDITION
a. Turn the ignition switch ON.
b. Lights auto ON:
Gradually cover the top of the sensor.
c. Check that the lights go off under the following conditions.
1. Light control switch is OFF.
2. The area surrounding the sensor gets bright.
3. The driver's door is opened with the ignition switch OFF.

INSPECT LIGHTS-ON CONDITION
a. Open the driver's door while the ignition switch is OFF.
b. Turn the light control switch to AUTO 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.







Connector disconnected:
INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT
Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in the chart.

HINT:
- Ignition switch is ON.
- Light control switch is in AUTO.
- Around the vehicle is light.

If circuit is as specified, perform the inspection on the following page.
If the circuits is not as specified, inspect the circuit connected to other parts.







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

HINT:
- Ignition switch is ON.
- Light control switch is in AUTO.
- Around the vehicle is light.

If circuit is as specified, inspect the circuit.
If the circuits is not as specified, replace the sensor with a new one.