Headlamp Dimmer Switch: 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 LIGHT CONTROL SWITCH CIRCUIT
Connector disconnected:
Disconnect the connector from the switch and inspect the connector on the wire harness side, as shown.
If circuit is not as specified, inspect the wire harness.







INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT
Connector disconnected:
Disconnect the connector from the switch and inspect the connector on the wire harness side, as shown.
If circuit is not as specified, inspect the wire harness.







INSPECT LIGHT CONTROL SWITCH CIRCUIT
Connector connected:
Connect the wire harness side connector to the light control and dimmer switch and inspect the connector from the back side, as shown.
If circuit is not as specified, inspect the wire harness.







INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT
Connector connected:
Connect the wire harness side connector to the light control and dimmer switch and inspect the connector from the back side, as shown.
If circuit is not as specified, inspect the wire harness.




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. Check the accessory lights and the headlights should turn ON.




INSPECT AUTOMATIC LIGHT CONTROL
AUTO OFF:
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. Gradually cover the top of the sensor.
Lights auto ON:
c. Check that the lights go OFF under the following condition
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 LIGHT-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.







INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT
Connector disconnected:
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 shown below.
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 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.