AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM(for Sedan) FAIL-SAFE CHART

  1. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

    1. The headlight leveling ECU assembly operates in fail-safe mode if an abnormal condition, such as any of the following, is detected.

      Item

      Abnormality Detection Condition

      Fail-safe Control

      Return Condition

      Multi-information Display Warning Message*2

      Warning Indicator*1

      Headlight leveling motor

      Communication stop

      • If the position of the malfunctioning headlight leveling motor is higher than the initial position, it is returned to its initial position.

      • If the position of the malfunctioning headlight leveling motor is lower than the initial position, it is stopped at its current position.

      Signals are received normally.

      "Headlight system malfunction. Visit your dealer." is displayed

      Illuminates

      • Open circuit

      • Short circuit

      • Overheat

      • Stops the abnormal headlight leveling motor at its current position.

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

      Ignition switch is turned off and then to ON again.

      "Headlight system malfunction. Visit your dealer." is displayed

      Abnormal voltage

      Normal value is detected.

      "Headlight system malfunction. Visit your dealer." is displayed

      Does not illuminate

      Wheel speed

      Abnormal wheel speed sensor signal

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

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

      The sensor(s) return to normal.

      Not displayed

      Does not illuminate

      Rear height control sensor sub-assembly

      Power source malfunction

      • If the position of the headlight leveling motors is higher than the initial position, the headlight leveling motors are returned to the initial position.

      • If the position of the headlight leveling motors is lower than the initial position, the headlight leveling motors are stopped at their current position.

      Ignition switch is turned off and then to ON again.

      "Headlight system malfunction. Visit your dealer." is displayed

      Illuminates

      Abnormal rear height control sensor sub-assembly signal

      Normal value is detected.

      CAN communication

      Main body ECU (multiplex network body ECU) communication error (headlight signal)

      Control is performed normally.

      Signals are received normally.

      Not displayed

      Does not illuminate

      Main body ECU (multiplex network body ECU) communication error (destination information, VAST request, time stamp)

      ECM communication error (Engine variation, Engine condition 1)

      Brake actuator assembly (Skid control ECU) communication error (vehicle speed signal)

      Control is performed as though the vehicle is stationary.

      Headlight leveling ECU assembly

      Abnormal headlight leveling ECU assembly signal

      Control is performed normally.

      Ignition switch is turned off and then to ON again.

      "Headlight system malfunction. Visit your dealer." is displayed

      Illuminates

      Initialization of rear height control sensor sub-assembly

      Initialization of rear height control sensor sub-assembly not completed

      Adjusts the position of the headlight leveling motors to the initial position.

      Initialization is completed

      "Headlight system malfunction. Visit your dealer." is displayed

      Flashes (2Hz 6 times)

      Abnormal rear height control sensor sub-assembly data from initialization

      Illuminates

      Synchronization of vehicle information

      Vehicle specifications have not been stored

      Adjusts the position of the headlight leveling motors to the initial position.

      Synchronization is completed

      "Headlight system malfunction. Visit your dealer." is displayed

      Illuminates

      Headlight leveling ECU assembly with incorrect vehicle specifications is installed

      • If the position of the headlight leveling motors is higher than the initial position, they are returned to their initial position.

      • If the position of the headlight leveling motors is lower than the initial position, they are stopped at their current position.

      Headlight leveling ECU assembly with correct vehicle specifications is installed

      • *1: for Multi-information Display (Segment LCD Type)

      • *2: for Multi-information Display (Color Type)