Lighting System Fail-Safe Chart

Body Electrical. Camry. Acv40 Gsv40
Lighting. Camry. Acv40 Gsv40

  1. Light control ECU (for HID headlight)

  1. Headlight beam level control ECU (with automatic headlight beam level control system)

Lighting System -- Fail-Safe Chart



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

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
  1. Output open
  2. Short between output terminals
  3. 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).

Headlight beam level control ECU (with automatic headlight beam level control system)

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

    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) is detected.
    		Normal voltage is detected 50 times 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.
    High power source voltage
    		Abnormal high ignition voltage (18.5 V or less) is detected.
    		Voltage of 17.5 V or less is detected
    		No illuminated
    Low power source voltage
    		Abnormal low ignition voltage (9.0 V or less) is detected
    		Voltage of 9.3 V or more is detected for 0.1 second consecutively
    		No illuminated
    Vehicle speed
    		Abnormal high speed (180 km/h or more) is detected.
    		Speed less than 175 km/h (109 mph) is detected
    		No illuminated
    Reset while running
    		Reset by a temporary blackout, etc. while running.
    		Vehicle is stopped
    		No illuminated