Fail-Safe Chart

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

The headlight leveling ECU assembly operates in fail-safe mode if an abnormal condition such as those listed below has been detected, and keep the last low beam status.

Item	Abnormality Detection Condition	Return Condition	Warning Indicator
Height control sensor power source voltage	Abnormal height control sensor power source voltage (4.6 V or less, or 6.25 V or more) is detected.	Abnormal voltage is not detected for 5 seconds consecutively	Illuminated
Height control sensor signal voltage	Abnormal height control sensor signal voltage (0.25 V or less, or 4.75 V or more) is detected.		Illuminated
High power source voltage	Abnormal high IG supply voltage (18.5 V or more) is detected.	Voltage of 17.5 V or less is detected	Not illuminated
Low power source voltage	Abnormal low IG supply voltage (9.0 V or less) is detected.	Voltage of 9.3 V or more is detected for 0.1 seconds consecutively	Not illuminated
Height control sensor data out of range	Height control sensor data out of range when performing initialization of the headlight leveling ECU assembly	Vehicle condition is proper for initialization.	Illuminated
Variation error	Headlight leveling ECU assembly for another destination is installed on the vehicle	Headlight leveling ECU assembly for proper destination is installed on the vehicle	Illuminated