Exterior Lighting System
LIGHTING (EXT): LIGHTING SYSTEM: SYSTEM DIAGRAM
Communication Table
Communication Table
SYSTEM DESCRIPTION
1. AUTOMATIC LIGHT CONTROL SYSTEM
When the headlight dimmer switch is in the AUTO position, the automatic light control system detects ambient light levels and controls the headlights, fog lights, taillights, clearance lights and license plate lights.
2. LIGHT AUTO TURN-OFF SYSTEM
The light auto turn-off system is used to prevent the driver from leaving the vehicle with the headlights, fog lights, taillights, clearance lights or license plate lights on.
The lights that turn off vary as shown in the table below according to the status of the exterior lights.
3. DAYTIME RUNNING LIGHT SYSTEM
The daytime running light system is designed to automatically illuminate the dimmed high beam headlights, during the daytime to make the vehicle more visible to other vehicles.
This system is controlled by the main body ECU.
This system is enabled when the following conditions are met:
* The engine switch is on (IG).
* The engine speed signal is input (the engine is running).
* Parking brake switch off.
* Headlight dimmer switch not in the DRL OFF position. (w/ DRL OFF switch)
* Headlight dimmer switch is in the off (w/o DRL OFF switch), tail or AUTO position (and the low beam headlights are not turned on via the automatic light control system).
4. HID HEADLIGHT SYSTEM (for HID Headlight)
The High Intensity Discharge (HID) headlight system uses a discharge bulb as its light source for the low 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 the discharge bulbs and light control ECUs.
The light control ECU transforms voltage that is input from the battery to high voltage of up to 20000 V and applies it to the discharge bulbs in order to illuminate them.
5. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM (w/ AFS)
*1: w/o Air Suspension System
*2: w/ Air Suspension System
(a) General
When the low beam headlights are on, the automatic headlight beam level control system operates the headlight leveling motor in accordance with the movement of the vehicle. The headlight swivel ECU controls the system.
(b) Function of Main Components
(c) Initial Set Control
When the engine is started, the headlight swivel ECU drives the headlight leveling motor and moves the headlight reflector to its lower operational limit, and then returns it to the proper position. The headlight swivel ECU thus assesses the position of the headlight for reference control.
NOTICE:
* Initialize the headlight swivel ECU after the headlight swivel ECU is replaced.
* Initialize the headlight swivel ECU (set the zero point of the height control sensor in the headlight swivel ECU) after the vehicle height changes due to replacement of suspension components or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly RH.
6. AFS [Adaptive Front-lighting System] (w/ AFS)
(a) General
The Adaptive Front-lighting System (AFS) is used in order to ensure a wide low beam lighting area and realize excellent visibility during turns by moving the low beam.
The AFS uses medium-to-high speed control and low speed control. In medium-to-high speed control, the system calculates the target lighting angle based on the steering angle and vehicle speed and changes the swivel angle of the low beam headlights individually. During 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.
(b) Function of Main Components
(c) Low Speed Control
The headlight swivel ECU performs low speed control when all of the following conditions are met:
* Engine is running.
* Vehicle is moving forward at a speed of 10 km/h (6 mph) or more and less than 30 km/h (19 mph).
* Steering angle is 6° or more.
* Low beam headlights are on.
* Daytime running light function is not operating.
* AFS is on.
Swivel Angle Range
(d) Medium-to-High Speed Control
The headlight swivel ECU performs medium-to-high speed control when all of the following conditions are met:
* Engine is running.
* Vehicle is moving forward at a speed of 30 km/h (19 mph) or more.
* Steering angle is 7.5° or more.
* Low beam headlights are on.
* Daytime running light function is not operating.
* AFS is on.
Swivel Angle Range
(e) Operation Stop Condition
The headlight swivel ECU stops control when any of the following conditions is met:
* Engine is stopped.
* Vehicle is moving forward at a speed of less than 10 km/h (6 mph).
* Steering angle is less than 6°.
* Low beam headlights are off.
* Daytime running light function is operating.
* AFS is off.
* Shift lever in R or N.
(f) Initial Set Control
When the engine is started, the headlight swivel ECU drives the headlight swivel motor and moves the headlight reflector toward the center of the vehicle until it reaches its operational limit, and then returns it to the proper position. The headlight swivel ECU thus assesses the position of the headlight for reference control.
NOTICE:
Initialize the headlight swivel ECU after the headlight swivel ECU is replaced.
7. AUTOMATIC HIGH BEAM SYSTEM (w/ 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 34 km/h (21 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 34 km/h (21 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 vehicle speed is less than 27 km/h (17 mph).
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.