Ambient Light Sensor: Testing and Inspection

INSPECT LIGHT CONTROL SWITCH CONTINUITY
If continuity is not as specified, replace the switch.







INSPECT HEADLIGHT DIMMER SWITCH CONTINUITY
If continuity is not as specified, replace the switch.

INSPECT AUTOMATIC LIGHT CONTROL

AUTO ON:
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 lights should turn ON the accessory lights first, and then the headlights.

INSPECT AUTOMATIC LIGHT CONTROL

AUTO OFF:
a. Gradually expose the sensor.
b. Verify that the lights should turn OFF the headlights first, and then the accessory lights.

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

INSPECT LIGHT-ON CONDITION
a. Open the driver's door while the ignition switch is OFF.
b. Leaving the door open, 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.







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.

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







INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT
Connector connected
Connect the wire harness side connector to the sensor and spect wire harness side connector from the back side.

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