LIGHTING SYSTEM SYSTEM DESCRIPTION


  1. AUTOMATIC LIGHT CONTROL SYSTEM

    When the light control switch is in the AUTO position, the automatic light control system detects ambient light levels and controls the low beam headlights, parking lights, taillights and license plate lights.

  2. LIGHT AUTO TURN-OFF SYSTEM

    The light auto turn-off system is used to prevent the exterior lights from being accidentally left on (low beam headlights, high beam headlights, front fog lights, rear fog lights, taillights, parking lights and license plate lights).

  3. DAYTIME RUNNING LIGHT SYSTEM

    The daytime running light system is designed to automatically illuminate the daytime running lights during the daytime to make the vehicle more visible to other vehicles.


    • This system is controlled by the main body ECU (multiplex network body ECU).

    • This system is enabled when the following conditions are met:


      • Power switch on (IG)

      • READY condition is received.

      • Parking brake switch off.

      • The light control switch is in off or AUTO position (and the low beam headlights are not turned on via the automatic light control system).

  4. LED HEADLIGHT SYSTEM


    1. General

      Compared to halogen or HID headlights, even if an LED headlight is used for a long time, the reduction of brightness over its lifetime is less. In addition, there is no possibility of an LED having an open circuit because of vibration. Together, these attributes realize maintenance free lighting.

    2. Function of Main Components

      Component Outline
      Light Control ECU

      • Turn on the LEDs immediately when the light control switch is turned to head position.

      • Regulates the output current flowing into the LEDs at a specified level to prevent the light from getting brighter and dimmer due to voltage variation.

      • Transmits fail signals to the main body ECU (multiplex network body ECU) when a malfunction occurs in the LED headlight system.
      Combination Meter Assembly Master Warning Light The master warning light flashes to inform the driver when the light control ECU detects malfunctions in this system
      Multi-information Display The multi-information display displays a warning message to inform the driver when the light control ECU detects a malfunction in this system.
      Main Body ECU (Multiplex Network Body ECU)

      • Receives fail signals from light control ECU when a malfunction occurs in the LED headlight system, and transmits signals to the combination meter assembly.

      • Stores Diagnostic Trouble Codes (DTCs) when the system malfunctions

  5. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM


    1. General


      • This system maintains the low beam headlights at a constant level while the vehicle is stopping.

      • This system is controlled by the headlight leveling ECU assembly. The headlight leveling ECU assembly detects the vehicle posture via the rear height control sensor sub-assembly RH, and detects the vehicle speed via the combination meter assembly. The headlight leveling ECU assembly controls each headlight leveling motor (headlight unit) based on these pieces of information in order to change the headlight reflector angle.

      Note


      • Initialize the rear height control sensor sub-assembly RH signal after the vehicle height changes due to replacement of the suspension or after operations as reinstallation or replacement of the rear height control sensor sub-assembly RH.

      • When the headlight leveling ECU assembly is replaced, initialization is also necessary.

    2. Function of Main Components

      Component Outline
      Rear Height Control Sensor Sub-assembly RH Detects vehicle height.
      Combination Meter Assembly

      • Outputs the vehicle speed signal to the headlight leveling ECU assembly.

      • The headlight beam level control system indicator light in the combination meter illuminates for 3 seconds and then goes off when the power switch is turned to ON (bulb check function).

      • The headlight beam level control system indicator light in the combination meter illuminates to alert the driver when a malfunction in this system is detected.
      Headlight Leveling Motor (Headlight Unit) Based on the signals received from the headlight leveling ECU assembly, each motor moves the reflector in the headlight to vary its low beam.
      DLC3 The rear height control sensor sub-assembly RH signal initialization and headlight leveling motor (headlight unit) operation check can be performed via the DLC3.
      Headlight Leveling ECU Assembly

      • Based on the signals that are transmitted by the rear height control sensor sub-assembly RH and combination meter assembly, the headlight leveling ECU assembly detects the amount of variance of the vehicle posture while the vehicle is stopping.

      • Based on the detected value, the headlight leveling ECU assembly outputs control signals to the headlight leveling motor (headlight unit).

      • The headlight leveling ECU assembly turns on the headlight beam level control system indicator light for 3 seconds when the power switch is turned to ON (bulb check function).

      • The headlight leveling ECU assembly turns on the headlight beam level control system indicator light to alert the driver when a malfunction in this system is detected.