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.
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HOMESERVICE MANUALSLEXUS1997ES 300 V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - LIGHTING AND HORNSHEADLAMP CONTROL MODULEDESCRIPTION AND OPERATIONAUTOMATIC LIGHT CONTROL
1997 Lexus ES 300 V6-3.0L (1MZ-FE)
Automatic Light Control
1997 Lexus ES 300 V6-3.0L (1MZ-FE)SECTION Automatic Light Control
With the ignition SW turned ON, current flows from the ECU-IG fuse to TERMINAL 1 of the automatic light control sensor. Voltage is applied at all times to TERMINAL 2 of the automatic light control sensor through the DOME fuse, and to TERMINAL 7 of the automatic light control sensor through the taillight relay (coil side), and to TERMINAL 5 of the automatic light control sensor through the head relay (coil side).
AUTOMATIC LIGHT CONTROL
When the light control SW is at AUTO position, if the automatic light control sensor detects a decrease in the ambient light (to between approx. 90 and approx. 475 lux), the automatic light control sensor is activated. About 5 seconds after it is activated, current flows from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW --> TERMINAL 16 --> GROUND, lighting up the headlight and taillight.
If the ambient light drops below approx. 90 lux, the automatic light control sensor is activated and about 3 seconds later, current flows from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW --> TERMINAL 16 --> GROUND, lighting up the headlight and taillight.
When the light control SW is at AUTO position and activation of the automatic light control sensor has turned ON the headlights and taillights, if the automatic light control sensor detects the ambient light above approx. 1000 lux. the sensor is turned OFF after about 5 seconds. so the current from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW is cut OFF, and the headlights and taillights turn OFF.
AUTOMATIC LIGHT CONTROL
When the light control SW is at AUTO position, if the automatic light control sensor detects a decrease in the ambient light (to between approx. 90 and approx. 475 lux), the automatic light control sensor is activated. About 5 seconds after it is activated, current flows from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW --> TERMINAL 16 --> GROUND, lighting up the headlight and taillight.
If the ambient light drops below approx. 90 lux, the automatic light control sensor is activated and about 3 seconds later, current flows from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW --> TERMINAL 16 --> GROUND, lighting up the headlight and taillight.
When the light control SW is at AUTO position and activation of the automatic light control sensor has turned ON the headlights and taillights, if the automatic light control sensor detects the ambient light above approx. 1000 lux. the sensor is turned OFF after about 5 seconds. so the current from TERMINAL 6 of the sensor to TERMINAL 12 of the light control SW is cut OFF, and the headlights and taillights turn OFF.
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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.