Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Section 570 (Headlight & Taillight System): Inspection
- INSPECT LIGHT CONTROL SWITCH CONTINUITY LIGHT CONTROL SWITCH CONTINUITY SPECIFICATIONS
Switch Position Tester Connection Specified Condition OFF - No Continuity TAIL 14 - 16 Continuity HEAD 13 - 14 - 16 Continuity AUTO 12 - 16 Continuity If continuity is not as specified, replace the switch.
- INSPECT HEADLIGHT DIMMER SWITCH CONTINUITY HEADLIGHT DIMMER SWITCH CONTINUITY SPECIFICATIONS
Switch Position Tester Connection Specified Condition Flash 7 - 8 - 16 Continuity Low Beam 16 - 17 Continuity High Beam 7 - 16 Continuity If continuity is not as specified, replace the switch.
- INSPECT HEADLIGHT CONTROL RELAY CONTINUITY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If continuity is not as specified, replace the relay.
- INSPECT TAILLIGHT CONTROL RELAY CONTINUITY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If continuity is not as specified, replace the relay.
- INSPECT DRL NO. 4 RELAY CIRCUIT
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If continuity is not as specified, replace the relay.
- INSPECT DIMMER RELAY CIRCUIT DIMMER RELAY CIRCUIT CONTINUITY SPECIFICATIONS
Condition Tester Connection Specified Condition Constant 1 - 2, 3 - 4 Continuity Apply B+ Between Terminals 1 And 2. 3 - 5 Continuity If continuity is not as specified, replace the relay.
- AUTO ON: INSPECT AUTOMATIC LIGHT CONTROL
- Turn the ignition switch ON.
- Turn the light control switch to AUTO.
- Gradually cover the top of the sensor.
- Check that the accessory lights and the headlights should turn ON.
- AUTO OFF: INSPECT AUTOMATIC LIGHT CONTROL
- Gradually expose the sensor.
- Check that the headlights and the accessory lights should turn OFF.
- INSPECT LIGHTS-OFF CONDITION
- Turn the ignition switch ON.
- Lights auto ON: Gradually cover the top of the sensor.
- 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) After the ignition switch is turned OFF and after 30 sec. from when open doors are all closed.
- 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.
- ADJUST AUTOMATIC LIGHT CONTROL SENSOR
- Adjustment of the light control is performed by turning the sensitivity knob on the sensor.
- This will be determined by 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.
- 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 in the table.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.