Lighting and Horns: Description and Operation
LIGHTING: LIGHTING SYSTEM: SYSTEM DIAGRAM
SYSTEM DESCRIPTION
1. HID HEADLIGHT SYSTEM
The HID (High Intensity Discharge) headlight system uses a discharge bulb as its light source for the Lo beam. Discharge bulbs are superior to halogen bulbs.
Discharge bulbs have the following features.
* The light emitted by the bulb is close in color to sunlight. The light shines ahead over a broader area and further forward, increasing the area visible to the driver.
* Less power is consumed.
This system consists of discharge bulbs and headlight control ECUs.
The headlight control ECU transforms the voltage that is input from the battery to a high voltage of up to 20000 V and applies it to the discharge bulbs in order to illuminate them.
A fail-safe function is provided as a countermeasure against the high voltage that is generated in case that a problem occurs in the headlight system.
2. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
When the headlights are on, the automatic headlight beam level control system operates the headlight level actuator in accordance with movement of the vehicle.
The automatic headlight beam level control system mainly consists of the AFS ECU, front and rear height control sensor, and 2 headlight level actuators.
On models without the air suspension system, the AFS ECU calculates changes in the vehicle posture based on the signals from the height control sensor (front and rear) and each ECU.
On models with the air suspension system, the AFS ECU calculates changes in the vehicle posture based on the signals from the air suspension ECU and each ECU.
The ECU then controls the headlight level actuator based on this information, in order to change the headlight reflector angle.
3. AFS
An intelligent AFS (Adaptive Front-lighting System) is used in order to ensure a wide Lo beam lighting area and realize excellent visibility during turns by moving the Lo beam.
The intelligent AFS of the this vehicle uses medium-to-high speed control and low speed control. In the medium-to-high speed control, the system calculates the target lighting angle based on the tire angle and vehicle speed and changes the swivel angle of the low-beam headlights individually. During the low speed control, the system calculates the target lighting angle based on the steering angle and changes the swivel angle of the low-beam headlight on the side facing into the turn.
4. AUTOMATIC HIGH BEAM SYSTEM
(a) General
The automatic high beam system enhances the illumination of the area to the front of the vehicle to improve visibility for the driver. It works by detecting light from the front using the camera built into the inner rear view mirror assembly and switching between the high beams and low beams automatically.
(b) Function of Main Components
(c) Basic Function
(1) When all of the following conditions are met, the automatic high beam system is activated and the automatic high beam indicator light turns on:
The engine switch is on (IG).
The light control switch is in the AUTO position and the low beam headlights are on.
The dimmer switch is in the high position.
(2) When all of the following conditions are met, the low beams automatically change to the high beam after a short delay:
The vehicle speed is more than approximately 32 km/h (20 mph).
The area in front of the vehicle is dark.
There are no oncoming vehicles with headlights on.
There are no preceding vehicles with taillights on.
There are few street lights along the street ahead.
(3) When any of the following conditions are met, the high beams automatically change to the low beams after a short delay:
The vehicle speed is less than 32 km/h (20 mph).
The level of ambient light is higher than a specified threshold.
There are oncoming vehicles with headlights on.
There are preceding vehicles with taillights on.
There are several street lights along the street ahead.
(4) When any of the following conditions are met, the automatic high beam system will be canceled and the indicator light will turn off.
The engine switch is turned off.
The light control switch is turned to any position except the AUTO position.
The low beam headlights are turned off.
The dimmer switch is moved to the low position.
HINT
It is possible to manually switch between the high beams and low beams using either of the following operations:
* Turn the light control switch from the AUTO position to the head position. In this case, the high beams turn on according to the dimmer switch high position. To change to the low beams, move the dimmer switch to the low position.
* Move the dimmer switch from the high position to the low position. In this case, the low beams turn on according to the dimmer switch position.
HINT
The automatic high beam system monitors the area in front of the vehicle using the camera built into the inner rear view mirror assembly and makes a judgment to change from the low beams to the high beams when the surrounding area is dark (there are no headlights from oncoming vehicles and no taillights from vehicles in front). High beam control limitations:
* When the surrounding area is not dark enough, the low beams will not change to the high beams even if the low beam headlights are turned on by the automatic light control system and the automatic high beam indicator light on the combination meter assembly illuminates. (The light level sufficient to turn the auto low beams on is not the same as the light level required to automatically change the low beams to the high beams.)
* When an oncoming vehicle suddenly appears at a sharp curve or a vehicle crosses the path of the vehicle, the high beams may not change to the low beams.
* When the fog lights of an oncoming vehicle are detected, the high beams may change to the low beams.
* The timing of the change between the high beams and low beams may differ depending on the brightness of headlights or fog lights from oncoming vehicles or the taillights of preceding vehicles.
* The timing of the change between the high beams and low beams may differ between normal conditions (good weather) and when driving on wet, frozen or snowy roads.
* The timing of the change between the high beams and low beams may differ depending on the number of occupants and amount of cargo present.
* Be aware that on some occasions, the high beams and low beams may change unexpectedly.
HINT
The camera built into the inner rear view mirror assembly continually monitors the light level in the area in front of the vehicle. There is a delay in switching the low beams to the high beams. Even when there is no ambient light, the low beams will not change to the high beams immediately. The delay will vary depend on the situation.
5. LANE CHANGE FLASHER SYSTEM
When moving the turn signal switch to the lane change position (it is not necessary to hold the switch) during a lane change, the turn signal light flashes a specified number of times.
While the turn signal light is flashing after the turn signal switch is moved to the lane change position (it is not necessary to hold the switch), the turn signal light turns off if the turn signal switch is moved in the opposite direction.
The main body ECU controls this system.
6. ILLUMINATED ENTRY SYSTEM
The illuminated entry system of this vehicle controls the following lights: engine switch illumination, door mirror foot light, seat belt buckle switch illumination, door inside handle illumination, interior light (for front and rear) and interior foot light.
The main body ECU controls this system.
7. INTERIOR LIGHT CONTROL
The interior light control (front interior light, engine switch illumination) consists primarily of the fade-in/fade-out function and timer illumination function.
8. INTERIOR FOOT LIGHT CONTROL AND DOOR INSIDE HANDLE ILLUMINATION CONTROL
The interior foot light control and door inside handle illumination control consist primarily of the fade-in/fade-out function and timer illumination function.
9. DOOR MIRROR FOOT LIGHT CONTROL
The door mirror foot light control consists primarily of the fade-in/fade-out function and timer illumination function.
10. SEAT BELT BUCKLE SWITCH ILLUMINATION CONTROL
The seat belt buckle switch illumination control consists primarily of the fade-in/fade-out function and timer illumination function.
11. BATTERY SAVING CONTROL
When the following 2 conditions have been met, battery saving control turns off the lights illuminated by the illuminated entry controls (interior light control and interior foot light illumination control).
The engine switch is turned off.
There is no change in the condition of the doors for 20 minutes.
12. 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 headlights and taillights (parking lights, taillights and license plate lights).
Ambient light levels are detected by the light control sensor that is integrated into the air conditioning system's front solar sensor.
The main body ECU controls this system.
13. LIGHT AUTO TURN OFF SYSTEM
The light auto turn off system is used to prevent the driver from leaving the vehicle with the exterior lights (headlights, fog lights, parking lights, taillights and license plate lights) ON.
This system turns all exterior lights OFF approximately 30 seconds after either of the following conditions is met:
* The engine switch is turned off, any door is opened and all the doors and luggage compartment door are closed with all exterior lights ON.
* The engine switch is turned off, all the doors are closed and the luggage compartment door is opened and closed with all exterior lights ON.
This system turns all exterior lights OFF immediately when the lock button on the wireless remote control is pushed with all the doors are locked.
When the engine switch is turned off and the driver's door is opened with the exterior lights other than the headlights ON, this system turns them OFF.