AFS (ADAPTIVE FRONT-LIGHTING SYSTEM) FAIL-SAFE CHART


  1. AFS

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

    Item Abnormality Detection Condition Leveling Fail-safe Control Swivel Fail-safe Control Return Condition Warning Indicator
    Headlight swivel motor (swivel function) Communication stop Lowers the headlight swivel motor 0.8° and continues control. Returns both headlights to the front position. Signals are received normally. Flashes

    • Open circuit

    • Short circuit

    • Overheat

    • Gear malfunction

    • Returns the normal headlight swivel motor to the front position.

    • Stops the abnormal headlight swivel motor at the current position.

    		 Ignition switch is turned to ON again.
    Abnormal voltage Normal value is detected. Does not illuminate
    Headlight swivel motor (leveling function) Communication stop

    • If the position is higher than the initial position, the headlight swivel motor is returned to the initial position.

    • If the position is lower than the initial position, the headlight swivel motor is stopped at the current position.

    		 Returns both headlight swivel motors to the initial position. Signals are received normally. Flashes

    • Open circuit

    • Short circuit

    • Overheat

    • Stops the abnormal headlight swivel motor at the current position.

    • If the position of the normal motor is higher than the initial position, it is returned to the initial position. If the position of the normal motor is lower than the initial position, it is stopped at the current position.

    		 Ignition switch is turned to ON again.
    Abnormal voltage Normal value is detected. Does not illuminate
    Steering angle sensor Abnormal steering angle sensor Continues control. Returns both headlights to the front position. Ignition switch is turned to ON again. Flashes
    Wheel speed Abnormal wheel speed sensor

    • If either of the wheel speed signals is abnormal, control continues using the normal signal.

    • If both of the wheel speed signals are abnormal, judgment is performed as though the vehicle is stationary and control continues.

    		 Continues control using the same speed as before the sensor malfunction detection, the headlight swivel motors are returned to the initial position. When the sensor(s) return to normal. Flashes
    Height control sensor Abnormal vehicle angle (front to rear inclination)

    • If the headlight swivel motor position is higher than the initial position, the headlight swivel motors are returned to the initial position.

    • If the headlight swivel motor position is lower than the initial position, the headlight swivel motors are stopped at the current position.

    		 Returns both headlight swivel motors to the initial position. Normal value is detected. Flashes
    Power source malfunction Ignition switch is turned to ON again.
    Abnormal height control sensor signal Normal value is detected.
    CAN communication Main body ECU (multiplex network body ECU) communication error (headlight signal) Continues control. Returns both headlight swivel motors to the initial position. Signals are received normally. Flashes
    Main body ECU (multiplex network body ECU) communication error (destination information, VAST request, time stamp) Continues control.
    ECM communication error (power source mode on IG signal)
    ECT ECU communication error (gear signal) Returns both headlight swivel motors to the initial position.
    Steering sensor communication error (steering angle signal)
    Skid control ECU communication error (vehicle speed signal) Control continues. Control is performed as though the vehicle is stationary.
    AFS ECU Abnormal AFS ECU Continues control. Continues control. Ignition switch is turned to ON again. Flashes
    Initialization of height control sensor Initialization of height control sensor not completed Adjusts the headlight swivel motor position to a step value so that the height will be as same as that of an unloaded vehicle. Returns both headlight swivel motors to the initial position. Initialization is completed Flashes (6 times)
    Abnormal height sensor data at initialization Flashes
    Synchronization of vehicle information Vehicle specifications have not been stored Adjusts the headlight swivel motor position to a step value so that the height will be as same as that of an unloaded vehicle. Returns both headlight swivel motors to the initial position. Synchronization is completed Flashes
    AFS ECU for another vehicle specification is installed

    • If the position is higher than the initial position, the headlight swivel motor is returned to the initial position.

    • If the position is lower than the initial position, the headlight swivel motor is stopped at the current position.

    		 AFS ECU for current vehicle specification is installed