LIGHTING SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE


    1. Light control ECU

      The light control ECU executes the fail-safe actions listed below in accordance with the item that has been detected.

      Item Outline
      Detection of Abnormal Input Voltage

      • If voltage that is input to the light control ECU deviates from the operating voltage range (9 to 16 V), the ECU stops illuminating the headlights, and resumes illuminating the headlights once the voltage reverts to the operating voltage range

      • However, if input voltage decreases after the headlights have illuminated, the headlights will remain illuminated as long as possible
      Detection of Abnormal Output (open or short circuit) or Flashing Bulb If an abnormal condition (open or short circuit) occurs in voltage that is output by the light control ECU, or if the bulb flashes, the ECU stops illuminating the headlights and will maintain this state until power is reinstated (by turning the headlight control switch off and then on again)
      Detection of Bulb Open If a bulb is not inserted in its socket, the ECU stops generating high voltage until the bulb is inserted correctly and power is reinstated (by turning the headlight control switch off and then on again or turning the engine switch off and then on (IG) again)

    2. AFS ECU

      Tech Tips

      If a malfunction is detected, the headlight swivel ECU assembly (AFS ECU) performs fail-safe operation. Depending on the malfunction, the ECU flashes at 1 Hz intervals or illuminates the AFS OFF indicator in the combination meter assembly. Warning massages are also shown on the multi-information display.

      Item Detection Condition Leveling Motor Control Swivel Motor Control Operation Restore Condition Indicator

      Swivel motor

      (motor)

      • Open

      • Short

      • Overheat

      • Continues with the right and left leveling motor positions lowered by 0.7° from the current position.

      • The normal swivel motor returns to the initial position.

      • The abnormal swivel motor stops at the current position.

      • Engine switch is turned on (IG) again

      		 Blinks

      • Gear malfunction

      • Engine switch is turned on (IG) again

      • Position change is detected

      • Stop position error

      • Engine switch is turned on (IG) again

      • Normal stop position is detected

      Swivel motor

      (sensor)

      • Open

      • Short

      • Continues

      • Returns to the initial position.

      • Engine switch is turned on (IG) again

      • Normal stop position is detected

      		 Blinks
      Steering angle sensor

      • Trouble information is received

      • Communication error

      • Continues with the right and left leveling motors lowered by 0.7° from the current position.

      • Continues after the swivel motor returns to the initial position.

      • Stops at the current position and then returns to the initial position.

      • Engine switch is turned on (IG) again

      • Normal value is detected

      		 Blinks
      Speed sensor

      • Open

      • Short

      • Continues using the normal vehicle speed signal that is supplied by the skid control ECU if one sensor is malfunctioning.

      • Judges that the vehicle is stationary and continues to control if both speed sensor signals malfunction.

      • If one sensor is malfunctioning, the swivel motor is controlled using the normal vehicle speed signal that is supplied by the skid control ECU, and the motor returns to the initial position.

      • If both sensors are malfunctioning, the motor returns to the initial position.

      • Engine switch is turned on (IG) again

      		 Blinks
      Height control sensor

      • Open

      • Short

      • Pitch angle error

      • Power source trouble

      • If the leveling motor position is higher than the initial position, the leveling motor is returned to the initial position. If the leveling motor position is lower than its initial position, the leveling motor stays at the current position.

      • Returns to the initial position.

      • Engine switch is turned on (IG) again

      • Normal value is detected

      		 Blinks
      Leveling motor

      • Open

      • Short

      • Overheat

      • The abnormal leveling motor stops at the current position.

      • The normal leveling motor returns to its initial position if its current position is higher than the initial position. The normal leveling motor will stop at the current position if this position is lower than the initial position.

      • Returns to the initial position.

      • Engine switch is turned on (IG) again

      		 Blinks
      BEAN communication

      • Interruption of headlight signal communication

      • Interruption of headlight signal from the windshield wiper switch assembly

      • Interruption of steering sensor zero-point signal

      • Interruption of front wheel speed signal communication

      • Continues

      • Returns to the initial position.

      • Signal is no longer interrupted.

      		 Blinks

      • Interruption of AFS OFF switch signal

      		 Illuminates

      • Interruption of engine speed signal communication

      • Interruption of vehicle speed signal communication

      • Continues

      		 Blinks
      AFS ECU

      • ECU internal malfunction

      • Continues

      • Continues

      • Engine switch is turned on (IG) again

      		 Goes off
      Wheel speed data error

      • Abnormal front wheel speed signal is received from the skid control ECU

      • Continues

      • Returns to the initial position.

      • Normal signal is received.

      		 Blinks