1997 Toyota Avalon headlights

Tiny
MICHAEL LAMB
  • MEMBER
  • 1997 TOYOTA AVALON
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 192,000 MILES
My car was parked in the driveway suddenly the headlights went on, I got in the car and tried to turn them off (the were not on when last I left the car) turning the light switch on & off several times had no effect. I finally disconnected the battery to turn the lights off, so that I did not kill the battery. Whats wrong?
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Saturday, November 15th, 2008 AT 6:57 PM

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Tiny
IMPALASS
  • EXPERT
Hello

It could be your light switch, your ambient light sensor, integration relay......hard to say.

I am sending you the test for the sensor and how to adjust. Try that and see what happens.

AUTOMATIC LIGHT CONTROL SYSTEM INSPECTION


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INSPECT AUTOMATIC LIGHT CONTROL
AUTO ON:

Turn the ignition switch ON .
Turn the light control switch to AUTO.
Gradually cover the top of the sensor.
Make sure that the lights should turn ON the accessory lights and headlights.


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INSPECT AUTOMATIC LIGHT CONTROL
AUTO OFF:

Gradually expose the sensor.
Make sure that the lights should turn OFF the headlights and accessory lights.
3. INSPECT LIGHTS-OFF CONDITION

Turn the ignition switch ON .
Gradually cover the top of the sensor. Lights auto ON :
Make sure that the lights will go out when the light control switch is OFF , the area surrounding the sensor gets bright or open the driver's door while the ignition switch is OFF .
4. INSPECT LIGHTS-ON CONDITION

Open the driver's door while the ignition switch is OFF .
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 .
5. ADJUST AUTOMATIC LIGHT CONTROL SENSOR

Adjustment of the light control is performed by turning the sensitivity knob on the sensor.


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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.
6. INSPECT SENSOR CIRCUIT


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Connector Disconnected
Disconnect the connector from the sensor and inspect the connector on the wire harness side, as shown in the chart.

If the circuit is as specified, perform the following inspection.

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


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Connector Connected
Connect the wire harness side connector to the sensor and inspect wire harness side connector from the back side. as shown.

If the circuit is as specified, try replacing the sensor with new one.

If the circuit is not as specified, inspect the circuit connected to other parts.
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Saturday, November 15th, 2008 AT 7:25 PM

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