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 should turn ON.




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




ADJUST AUTOMATIC LIGHT CONTROL SENSOR
a. Adjustment of the light control is performed by turning the sensitivity knob on the sensor.
b. This will be determined at what light condition the automatic control will take place.
- If response is too quick, turn the knob counterclockwise.
- If response is too slow, turn the knob clockwise.




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 ON.
- Light control switch AUTO.




- 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.




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 table.




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