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.