LIGHTING SYSTEM SYSTEM DESCRIPTION

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.

LIGHT AUTO TURN-OFF SYSTEM (for European Models)

The light auto turn-off system is used to prevent forgetting to turn off the exterior lights (headlights, front fog lights, taillights, parking lights, license plate lights).

• This system has the following functions.

LIGHT AUTO TURN-OFF SYSTEM (except European Models)

1. General

   The light auto turn-off system is used to prevent the driver from leaving the vehicle with the headlights, front fog lights, parking lights, taillights or license plate lights on.

2. When all of the following conditions are met, the headlights, front fog lights, parking lights, taillights and license plate lights turn off:

   
   

   • The power switch is turned from on (IG) to off.

   • The headlights, front fog lights, parking lights, taillights or license plate lights are on.

   • The driver door is opened.

DAYTIME RUNNING LIGHT CONTROL FUNCTION

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

• This function is controlled by the main body ECU (multiplex network body ECU) and DRL relay. The main body ECU (multiplex network body ECU) transmits a turn ON signal to the DRL relay, which illuminates the daytime running lights.

• This function 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 or AUTO position (and the taillights are not turned on via the automatic light control system).

LED HEADLIGHT SYSTEM

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 failure signals to the main body ECU (multiplex network body ECU) when a malfunction occurs in the LED headlight system.
   Combination Meter Sub-assembly	Comes on the LED headlight warning light to inform the driver when the light control ECU detects malfunctions in this system.
   Main Body ECU (Multiplex Network Body ECU)	Receives failure signals from the light control ECU when a malfunction occurs in the LED headlight system, and transmits the signals to the combination meter sub-assembly. Stores Diagnostic Trouble Codes (DTCs) when the system malfunctions. Depending on the malfunction that occurs in the LED headlight system, the LED headlight warning light may illuminate even if the LED headlights are operating.

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, and detects the vehicle speed via the combination meter sub-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 signal after the vehicle height changes due to replacement of the suspension or after operations such as reinstallation or replacement of the rear height control sensor sub-assembly.

   • 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	Detects vehicle height.
   Combination Meter Sub-assembly	Outputs the vehicle speed signal to the headlight leveling ECU assembly. The headlight beam level control system indicator light and the LED headlight warning light in the combination meter sub-assembly 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 sub-assembly 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 and combination meter sub-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.