AUTOMATIC HIGH BEAM SYSTEM
General
The automatic high beam system enhances the illumination of the area in 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 turning the high beams of the headlights on or off automatically.
Function of Main Components
| Component | Outline |
|---|---|
| Automatic High Beam Sensor (Inner Rear View Mirror Assembly) | Determines when to turn the high beams on and off after identifying the lights of oncoming vehicles, preceding vehicles and other lights from the picture information of its camera sensor. Then, it sends high beam request signals to the AFS ECU (headlight swivel ECU assembly) via LIN communication. |
| AFS ECU (Headlight Swivel ECU Assembly) | Acts as the gateway between the automatic high beam sensor (inner rear view mirror assembly) which uses LIN and CAN communication. In addition, it stores Diagnostic Trouble Codes (DTCs) if an automatic high beam sensor (inner rear view mirror assembly) malfunction occurs. |
| Steering Angle Sensor (Spiral Cable Sub-assembly) | Outputs the steering angle information to the AFS ECU (headlight swivel ECU assembly). |
| Skid Control ECU | Outputs the information about the speed of the right front wheel. This information is used by the automatic high beam sensor (inner rear view mirror assembly) to turn the high beams on and off. |
| Combination Meter Assembly | Displays the automatic high beam indicator light when it receives illuminate or blink request signals from the main body ECU (multiplex network body ECU). Tech Tips
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| Main Body ECU (Multiplex Network Body ECU) |
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| ECM | Outputs a signal to indicate that the shift lever is in R. Based on this signal, the automatic high beam sensor (inner rear view mirror assembly) turns the high beams off. |
Basic Function
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 ignition switch is ON.
The light control switch is in the AUTO position and the low beam headlights are on.
The dimmer switch is in the high position.
When all of the following conditions are met, high beams automatically turn on after a short delay:
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 streetlights along the street ahead.
When any of the following conditions are met, the high beams automatically turn off after a short delay:
Vehicle speed is less than 27 km/h (17 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.
Light from streetlights ahead is higher than a specified threshold.
When any of the following conditions are met, the automatic high beam system will be canceled and the indicator light will turn off.
The ignition 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.
Tech Tips
It is possible to manually turn the high beams on and off 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.
Tech Tips
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 turn on the 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 high beams will not turn on 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 remain on.
When the fog lights of an oncoming vehicle are detected, the high beams may be turned off.
The timing of the high beams turning on and off may differ depending on the brightness of headlights or fog lights from oncoming vehicles or the taillights of preceding vehicles.
The timing of the high beams turning on and off may differ between normal conditions (good weather) and when driving on wet, frozen or snowy roads.
The timing of the high beams turning on and off may differ depending on the number of occupants and amount of cargo present.
Be aware that on some occasions, the high beams may switch on and off unexpectedly.
Tech Tips
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 turning on the high beams. Even when there is no ambient light, the high beams will not turn on immediately. The delay will vary depending on the situation.