Component Tests and General Diagnostics

INSPECTION




1. FAIL-SAFE FUNCTION (Light Control ECU)







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







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








4. Connector disconnected:
INSPECT LIGHT CONTROL SWITCH CIRCUIT
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.







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







6. Connector connected:
INSPECT LIGHT CONTROL SWITCH CIRCUIT
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.







7. Connector connected:
INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT
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.







8. INSPECT DAYTIME RUNNING LIGHT NO.3 AND NO.4 RELAY CONTINUITY
If continuity is not as specified, replace the relay.







9. INSPECT HEADLIGHT CONTROL RELAY CONTINUITY
If continuity is not as specified, replace the relay.

10. INSPECT HEADLIGHT CONTROL RELAY CIRCUIT







11. INSPECT HEADLIGHT DIMMER (DAYTIME RUNNING LIGHT NO.2) RELAY CONTINUITY
If continuity is not as specified, replace the relay.

12. INSPECT HEADLIGHT DIMMER (DAYTIME RUNNING LIGHT NO.2) RELAY CIRCUIT







13. INSPECT TAILLIGHT CONTROL RELAY CONTINUITY
If continuity is not as specified, replace the relay.

14. INSPECT TAILLIGHT CONTROL RELAY CIRCUIT










15. INSPECT DAYTIME RUNNING LIGHT MAIN RELAY CIRCUIT
Disconnect the connector from the relay and inspect the connector on the wire harness side.
If circuit is specified, try replacing the relay with a new one. If circuit is not as specified, inspect the circuits connected to other parts.




16. 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.




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

18. INSPECT LIGHT-OFF CONDITION
a. Turn the ignition switch ON.
b. Lights auto ON:
Gradually cover the top of the sensor.
c. Check that the lights go off under the following conditions.
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

19. 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.







20. 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.







21. 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.