System Description
LIGHTING (EXT): 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, marker lights 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, taillights, parking lights, license plate lights and marker lights).
* This system has the following functions.
3. DAYTIME RUNNING LIGHT SYSTEM (for Canada)
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).
4. DAYTIME RUNNING LIGHT SYSTEM (except Canada)
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).
5. LED HEADLIGHT SYSTEM
(a) 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.
(b) Function of Main Components
6. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
(a) 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.
NOTICE:
* 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.
(b) Function of Main Components
