LIGHTING SYSTEM FAIL-SAFE CHART


  1. 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 headlight dimmer switch is turned off.

  2. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

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

    Malfunctioning Part Detection Condition Leveling Fail-safe Control Warning Light
    Speed Sensor Speed sensor signal malfunction Continues control. Flashes
    Rear Height Control Sensor*1 Rear height control sensor signal malfunction

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

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

    		 Flashes
    Source voltage malfunction
    Suspension control ECU*2 Height control signal malfunction

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

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

    		 Flashes
    Source voltage malfunction
    Headlight Leveling Motor Headlight leveling motor communication error

    Normal headlight leveling motor:


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

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

    		 Flashes

    Headlight leveling motor malfunction


    • Open in circuit

    • Short in circuit

    • Overheated

    Normal headlight leveling motor:


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

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

    		 Flashes
    Voltage malfunction

    Abnormal headlight leveling motor:


    • Stops operation with the headlight motor at the current position.

    		 Off
    CAN Communication System

    Communication signal malfunction

    (Main body ECU)

    		 Continues control. Flashes

    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 Flashes
    Rear height control sensor initialization unconfirmed

    Both headlight leveling motors:


    • Stops operation with both motors at the same position as when the vehicle is empty.

    		 Blinks 6 times after ignition switch is turned from off to ON

    • *1: w/o Air Suspension System

    • *2: w/ Air Suspension System