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. Verify that the accessory lights and the headlights turn ON.




Auto OFF:
INSPECT AUTOMATIC LIGHT CONTROL
a. Gradually expose the sensor.
b. Verify that the headlights and the accessory lights turn OFF.

INSPECT LIGHT-OFF CONDITION
a. Turn the ignition switch ON.
b. Lights auto ON:
Gradually cover the top of the sensor.
c. Verify that the lights will go out when light control switch position is OFF or the area surrounding the sensor gets bright or open the driver's door while the ignition switch is 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.




ADJUST AUTOMATIC LIGHT CONTROL SENSOR
a. Adjustment of the light control is performed by turning the sensitivity knob on the sensor.
b. This will determine 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 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 circuit is as specified, perform the 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.

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.