Exterior Lighting System
LIGHTING (EXT): LIGHTING SYSTEM: SYSTEM DIAGRAM
1. AUTOMATIC LIGHT CONTROL SYSTEM
2. LIGHT AUTO TURN-OFF SYSTEM
Communication Table
3. DAYTIME RUNNING LIGHT SYSTEM
Communication Table
4. AUTOMATIC HIGH BEAM SYSTEM
Communication Table
5. HID HEADLIGHT SYSTEM
6. LED HEADLIGHT SYSTEM
Communication Table
7. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
Communication Table
8. AFS (ADAPTIVE FRONT-LIGHTING SYSTEM)
Communication Table
9. DOOR MIRROR FOOT LIGHT SYSTEM
Communication Table
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
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 power distributor (engine room junction block assembly). The main body ECU (multiplex network body ECU) transmits a turn ON signal to the power distributor (engine room junction block assembly), which illuminates the high beam headlights using duty control.
* This system is enabled when the following conditions are met:
* Power switch is on (IG)
* READY condition signal is received.
* Parking brake switch is off
* Light control switch is not in the DRL OFF position (w/ DRL OFF switch)
* Light control 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. 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 power 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 high beam after a short delay:
* Vehicle speed is more than approximately 20 mph (32 km/h).
* 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 low beams after a short delay:
* Vehicle speed is less than 20 mph (32 km/h).
* 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 power 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 low beams to high beams when the surrounding area is dark (there are no headlights from oncoming vehicles and no taillights from preceding vehicles). High beam control limitations:
* When the surrounding area is not dark enough, the low beams will not change to 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 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 low beams.
* When the fog lights of an oncoming vehicle are detected, the high beams may change to low beams.
* The timing of the change between 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 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 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 to the 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 high beams immediately. The delay will vary depending on the situation.
5. HID HEADLIGHT SYSTEM
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.
6. 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
7. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL 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 movement of the vehicle. The AFS ECU (headlight swivel ECU assembly) controls the system.
(b) Function of Main Components
(b) *1: w/o Air Suspension
*2: w/ Air Suspension
*3: w/ AFS
*4: w/o AFS
(c) Initial Set Control
When the engine is started, the AFS ECU (headlight swivel ECU assembly) drives the headlight leveling motor and moves the headlight reflector to the lower limit position and returns it to the proper position. The AFS ECU (headlight swivel ECU assembly) thus assesses the position of the headlight for reference control.
NOTICE:
* Initialize the AFS ECU (headlight swivel ECU assembly) when the AFS ECU (headlight swivel ECU assembly) is replaced.
* If the vehicle is not equipped with air suspension system, initialize the AFS ECU (headlight swivel ECU assembly) (set the zero point of the height control sensor in the AFS ECU (headlight swivel ECU assembly)) 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.
8. AFS (Adaptive Front-lighting System)
(a) General
* An 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.
(b) Function of Main Components
(c) Low Speed Control
* The AFS ECU (headlight swivel ECU assembly) performs the low speed control when all of the following conditions are met:
* READY condition signal is received.
* Vehicle is moving forward at a speed of 10 km/h (6 mph) or more.
* Vehicle is moving forward at a speed of 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 on/off condition is on.
Swivel Angle Range
(d) Medium-to-High Speed Control
* The AFS ECU (headlight swivel ECU assembly) performs the medium-to-high speed control when all of the following conditions are met:
* READY condition signal is received.
* 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 on/off condition is on.
Swivel Angle Range
(e) Operation Stop Condition
* The AFS ECU (headlight swivel ECU assembly) stops the control when any of the following conditions is met:
* READY condition signal is not received.
* 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 on/off condition is off.
* Shift lever is in R or N.
(f) Initial Set Control
When the READY condition signal is received, the AFS ECU (headlight swivel ECU assembly) drives the headlight swivel motor and moves the projector headlight to the operation limit in the direction toward the vehicle center and returns it to the proper position. The AFS ECU (headlight swivel ECU assembly) thus assesses the position of the headlight for reference control.
NOTICE:
* Initialize the AFS ECU (headlight swivel ECU assembly) when the AFS ECU (headlight swivel ECU assembly) is replaced.
9. DOOR MIRROR FOOT LIGHT SYSTEM
(a) General
* The door mirror foot light control consists primarily of the fade-in/fade-out function and timer illumination function.
* This control is controlled by the outer mirror control ECU assembly and main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) sends door mirror foot light on/off demand signals to the outer mirror control ECU assembly. According to various information, the outer mirror control ECU assembly performs fade-in/fade-out control of the door mirror foot lights.
(b) The door mirror foot light system has the following control functions:
