System Description

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, marker lights and license plate lights.

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, taillights, parking lights, license plate lights and marker lights).

• This system has the following functions.

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) and daytime running light relay. The main body ECU (multiplex network body ECU) transmits a turn ON signal to the daytime running light relay, which illuminates the high beam headlights using duty control.
• This system is enabled when the following conditions are met:
  • Power switch on (IG).
  • READY condition is received.
  • Parking brake switch off.
  • Light control switch is in the off, tail or AUTO position (and the low beam headlights are not turned on via the automatic light control 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) and daytime running light relay. The main body ECU (multiplex network body ECU) transmits a turn ON signal to the daytime running light relay, which illuminates the daytime running lights.
• This system is enabled when the following conditions are met:
  • Power switch on (IG).
  • READY condition is received.
  • Parking brake switch off.
  • Light control switch is in the tail or DRL position (w/o Automatic Light Control).
  • Light control switch is in the tail or AUTO position (and the low beam headlights are not turned on via the automatic light control system) (w/ Automatic Light Control).

1. General

   LED headlights are used to provide efficient, maintenance free lighting. 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.

2. Function of Main Components

   Component		Outline
   Light Control ECU		Turns on the LEDs immediately when the light control switch is turned to the 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	Flashes to inform the driver when the light control ECU detects malfunctions in this system.
   	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 the light control ECU when a malfunction occurs in the LED headlight system, and transmits the signals to the combination meter assembly. Stores Diagnostic Trouble Codes (DTCs) when the system malfunctions.

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 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 on (IG) (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	Based on the signals received from the headlight leveling ECU assembly, each motor moves the reflector in the headlight to vary its low beam.
   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. The headlight leveling ECU assembly turns on the headlight beam level control system indicator light for 3 seconds when the power switch is turned on (IG) (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.