Fail-Safe Chart

WARNING: This page is about a different car, the 2007 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

HID Headlight System

The light control ECU operates in the fail-safe mode if an abnormal condition such as those listed below has been detected.

Fig 1: Identifying Blinking Pattern

FAIL-SAFE MODE CHART

Item	Outline
Detection of abnormal input voltage (High input voltage)	If voltage that is input to the light control ECU is approximately 20 V or more, the ECU stops illuminating the headlights, and resumes when the voltage drops to 16 V or less.
Detection of abnormal input voltage (Low input voltage)	If voltage that is input to the light control ECU is 6 V or less, the ECU stops illuminating the low beam headlights, and resumes when the voltage is 10 V or more.
Detection of abnormal output Open Short between output terminals Short between output terminal and body ground	If an abnormal condition occurs in the voltage that is output by the light control ECU, the ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from OFF to HEAD).
Detection of bulb flashing	If the bulb flashing repeats within approximately 5 seconds and continues for approximately 60 seconds, the light control ECU stops illuminating low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from OFF to HEAD).
Detection of abnormal light voltage (Low light voltage)	After approximately 80 seconds since input voltage is supplied, if the light voltage is below approximately 31 V and continues for approximately 0.5 seconds, the light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from OFF to HEAD).
Detection of abnormal light voltage (High light voltage)	If the light voltage is above approximately 69 V and continues for approximately 0.5 seconds, the light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from OFF to HEAD).