Headlight And Taillight System: Inspection

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Inspect light control switch continuity :

Fig 1: Identifying Light Control Switch Positions & Terminals
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Fig 2: Light Control Switch Specifications
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If continuity is not as specified, replace the switch.
Inspect headlight dimmer switch continuity :

Fig 3: Headlight Dimmer Switch Specifications
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If continuity is not as specified, replace the switch.
INSPECT HEADLIGHT CONTROL RELAY CONTINUITY

Fig 4: Identifying Headlight Control Relay Terminals
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Fig 5: Headlight Control Relay Terminal Specifications
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If continuity is not as specified, replace the relay.
Inspect taillight control relay continuity :

Fig 6: Identifying Taillight Control Relay Terminals
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Fig 7: Taillight Control Relay Terminal Specifications
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If continuity is not as specified, replace the relay.
Inspect D.R.L. No. 2 relay circuit

Fig 8: Identifying D.R.L. No. 2 Relay Terminals
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Fig 9: D.R.L. No. 2 Relay Terminal Specifications
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If continuity is not as specified, replace the relay.
Inspect D.R.L. No. 3 relay circuit

Fig 10: Identifying D.R.L. No. 3 Relay Terminals
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Fig 11: D.R.L. No. 3 Relay Terminal Specifications
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If continuity is not as specified, replace the relay.
Inspect D.R.L. No. 4 relay circuit

Fig 12: Identifying D.R.L. No. 4 Relay Terminals
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Fig 13: D.R.L. No. 4 Relay Terminal Specifications
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If continuity is not as specified, replace the relay.
Auto ON, inspect automatic light control :
1. Turn the ignition switch ON.
2. Turn the light control switch to AUTO.
3. Gradually cover the top of the sensor.
  
  Fig 14: Testing Automatic Light Control Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the accessory lights and the headlights should turn ON.
Auto OFF, inspect automatic light control :
1. Gradually expose the sensor.
2. Check the headlights and the accessory lights should turn OFF.
Inspect lights-off condition :
1. Turn the ignition switch ON.
2. Lights auto ON, gradually cover the top of the sensor.
  
  Fig 15: Testing Lights Off Condition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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.
Inspect lights-on condition :
1. Open the driver's door while the ignition switch is OFF.
2. Turn the light control switch to AUTO leaving the door open and cover the top of the sensor, make sure that the lights go on when the ignition switch is turned ON.
Adjust automatic light control sensor :
1. Adjustment of the light control is performed by turning the sensitivity knob on the sensor.
2. 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.
    
    Fig 16: Adjusting Automatic Light Control Sensor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

Ignition switch ON.
Light control switch AUTO.
Vehicle's surroundings are bright.

Fig 17: Identifying Automatic Light Control Sensor Connector Terminals (Connected)

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Fig 18: Light Control Sensor Connector Terminal Specifications (Connected)

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.

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 :

Fig 19: Identifying Automatic Light Control Sensor Connector Terminals (Disconnected)
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Fig 20: Light Control Sensor Connector Terminal Specifications (Disconnected)
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Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in the table. See Fig 19.

If circuit is as specified, perform an ADJUSTMENT .

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