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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 137 (AUTOMATIC HEADLIGHTS)DESCRIPTION & OPERATIONAUTOMATIC HEADLIGHT BEAM LEVEL CONTROLFAIL-SAFE FUNCTION
2004 Toyota Celica GT, Standard
Fail-Safe Function
2004 Toyota Celica GT, StandardSECTION Fail-Safe Function
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
The headlight beam level control ECU operates in the fail-safe mode if an abnormal condition such as those listed below has been detected and illuminates the automatic headlight leveling system warning light in the instrument panel.
- Actuator - Holds the beam at the position of the actuator when the abnormality (open or short) has been detected.
- Rear Height Control Sensor - Returns the beam to the actuator's initial set position if a signal level abnormality has been detected higher than the initial set position. Holds the beam at the position of the actuator when a signal level abnormality has been detected, if the abnormality has been detected lower than the initial set position.
- Headlight Beam Level Control ECU - Holds the beam at position of the actuator when the abnormality (abnormal processing of the CPU) has been detected.
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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.