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. Make sure that the lights should turn ON the accessory lights and headlights.

AUTO OFF:

INSPECT AUTOMATIC LIGHT CONTROL
a. Gradually expose the sensor.
b. Make sure that the lights should turn OFF the headlights and accessory lights.

Connector disconnected:

INSPECT SENSOR CIRCUIT
Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in the chart.
If the circuit is as specified, perform the following inspection.
If the circuit is not as specified, inspect the circuit connected to other parts.

Connector connected:

INSPECT SENSOR CIRCUIT
Connect the wire harness side connector to the sensor and inspect wire harness side connector from the back side.
- If the circuit is as specified, try replacing the sensor with new one.
- If the circuit is not as specified, inspect the circuit connected to other parts.