LIGHTING SYSTEM FAIL-SAFE CHART


  1. Automatic Headlight Beam Level Control System (w/ Static Headlight Auto Leveling)


    1. The headlight leveling ECU operates in 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, or 6.25 V or more) is detected. Voltage of 4.61 to 6.24 V is detected 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. Voltage of 0.26 to 4.74 V is detected
      High power source voltage Abnormal high power source 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 power source voltage (9.0 V or less) is detected. Voltage of 9.3 V or more is detected Not illuminated
      Abnormal height control sensor signal while initialization Initialization is performed outside the valid range of the voltage for initialization. Initialization is successfully completed within the valid range of the voltage for initialization. Illuminated

  2. Automatic Headlight Beam Level Control System (w/ Dynamic Headlight Auto Leveling)

    If the headlight swivel ECU detects a malfunction in the automatic headlight beam level control system, it will take the actions indicated in the table below.

    Malfunctioning Part Detection Condition Fail-safe Control Warning Indicator
    Speed Sensor Speed sensor signal malfunction Continues control. Illuminated
    Rear Height Control Sensor LH (w/o Active Height Control Suspension) Rear height control sensor LH signal malfunction

    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).

    		 Illuminated
    Source voltage malfunction
    Height Control Sensor Signal (w/ Active Height Control Suspension) Height control sensor signal malfunction

    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).

    		 Illuminated
    Headlight Leveling Motor Headlight leveling motor communication error

    Abnormal side headlight leveling motor:


    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).

    Normal side headlight leveling motor:


    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).

    		 Illuminated

    Headlight leveling motor malfunction


    • Open in circuit

    • Short in circuit

    • Overheated

    Abnormal side headlight leveling motor:


    • Stops at the current position.

    Normal side headlight leveling motor:


    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).
    Headlight Leveling Motor Voltage malfunction

    Abnormal side headlight leveling motor:


    • Stops at the current position.

    Normal side headlight leveling motor:


    • Stops operation after returning the headlight leveling motor to the initial position (system fails when the headlight leveling motor is higher than the initial position).

    • Stops operation with the headlight leveling motor at the current position (system fails when the headlight leveling motor is lower than the initial position).

    		 Not illuminated
    CAN Communication System

    Vehicle specifications unconfirmed

    (Main body ECU)

    		 Continues control. Illuminated

    Communication signal malfunction

    (Main body ECU)

    Communication signal malfunction

    (Skid control ECU)

    		 Judges that the vehicle speed is 0 km/h (0 mph) and continues control.
    Headlight Swivel ECU Vehicle specifications unconfirmed Continues control. Illuminated
    Rear height control sensor LH initialization unconfirmed

    Both headlight leveling motors:


    • Stop at the same position as when the vehicle is empty.

    		 Blinks 6 times at 2 Hz after the ignition switch is turned from off to ON

  3. AUTOMATIC HIGH BEAM SYSTEM (w/ Automatic High Beam System)


    1. The main body ECU operates in fail-safe mode if an abnormal condition, such as those listed below, has been detected.

      Item Abnormality Detection Condition Return Condition Warning Indicator
      Speed Sensor Signal Malfunction Abnormal speed sensor signal is detected. Normal speed sensor signal is detected. Flashes
      CAN Communication Signal Malfunction Abnormal CAN communication signal is detected. Normal CAN communication signal is detected. Flashes
      Automatic High Beam Sensor Abnormal communication signal is detected. Normal communication signal is detected. Flashes