LIGHTING SYSTEM > FAIL-SAFE CHART

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

Item
Abnormality Detection Condition
Return Condition
Master Warning Light
Multi-information Display
Abnormal input voltage (High input voltage)
Abnormal power source voltage (more than 17 V) is detected.
Normal power source voltage (10 to 16 V) is detected.
Flashes
CHECK HEADLIGHT SYSTEM
Abnormal input voltage (Low input voltage)
Abnormal power source voltage (less than 10 V) is detected.
Normal power source voltage (10 to 16 V) is detected.
Flashes
CHECK HEADLIGHT SYSTEM
Abnormal output
  1. Open in output side circuit
  2. Short between output terminal and body ground
Light control switch is turned off.
Flashes
CHECK HEADLIGHT SYSTEM

AUTOMATIC LIGHT CONTROL SYSTEM
If the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control sensor, the main body ECU (multiplex network body ECU) performs fail-safe control to prohibit the automatic light control. If the low beam headlights and taillights are on, the lights will remain on until the light control switch is turned off.

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

  1. 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) 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.
    High power source voltage
    		Abnormal high ignition 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 ignition voltage (9.0 V or less) is detected.
    		Voltage of 9.3 V or more is detected for 0.1 seconds consecutively
    		Not illuminated
    Reset while running
    		Reset by a temporary blackout etc. while running.
    		Vehicle is stopped
    		Not illuminated