HIGH BEAM CONTROL (HBC) SYSTEM
id151000002300
Outline
• The high beam control (HBC) system turns the headlights HI off when the forward sensing camera (FSC) installed to the windshield recognizes a vehicle ahead and when traveling through towns and cities while the vehicle is being driven with the headlights HI turned on. As a result, driver visibility is assured while preventing blinding of other vehicles from headlight glare.
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Caution
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• Under the following conditions, the ability of the forward sensing camera (FSC) to detect light-emitting objects decreases, which could result in the system not operating normally and the inability to detect vehicles ahead.
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― Brightness of moonlight in surrounding area
― Poor visibility due to rain or fog
― Scratches or dirt on the camera lens or windshield glass
• Do not rely solely on the high beam control (HBC) system, and perform the appropriate switching operation based on a visual determination of the conditions.
• If the forward sensing camera (FSC) aiming is not completed correctly, the FSC cannot store the camera shooting angle and the High Beam Control (HBC) system may not operate normally. When performing the following servicing, always perform the forward sensing camera (FSC) aiming. In addition, for the FSC aiming procedure, refer to the [FORWARD SENSING CAMERA (FSC) AIMING] in the Workshop Manual.
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― Forward sensing camera (FSC) replacement
― Forward sensing camera (FSC) clip replacement
― Windshield replacement
Structural view
Function
• If the body control module (BCM) recognizes light-emitting objects (vehicles ahead, street lights (driving in city/town)) in front of the vehicle using the light-emitting object detection function while the vehicle is traveling with the headlights HI turned on, it turns off the headlights HI, and turns on the headlights HI when light-emitting objects are no longer detected.
• For the light-emitting object detection function of the forward sensing camera (FSC), refer to the [FORWARD SENSING CAMERA (FSC)]. (See
FORWARD SENSING CAMERA (FSC).)
Setting function for control order of precedence
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• If several light-emitting objects are recognized (vehicles ahead, street lights (driving in city/town)), control is conducted according to the following order of precedence.
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1. Closest on-coming vehicle
2. Closest vehicle ahead (no on-coming vehicles)
3. Street lights (driving in city/town)
Personalization feature
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• The High beam control (HBC) can be switched between ON (operational)/OFF (non-operational) (initial setting is ON (operational)). For details on personalization features, refer to [PERSONALIZATION FEATURES] in the workshop manual.
System conditions display
• The body control module (BCM) displays the system status using the HBC indicator light (green), HBC warning light (amber), and multi-information display in the instrument cluster.
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Condition
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HBC indicator light (green)
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HBC warning light (amber)
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Multi-information display
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Center display
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Light switch is in AUTO and dimmer switch is in position other than LO
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OFF
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OFF
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No display
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No display
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Headlights off
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Vehicle is stopped
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System set to off by personalization
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Light switch is in AUTO and dimmer switch is in LO and headlights are turned on
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ON
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Forward sensing camera (FSC) detects camera fogging
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OFF
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Warning display*1
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Warning display*2
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Forward sensing camera (FSC) detects that the camera is dirty
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Malfunction in HBC occurs
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ON
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Forward sensing camera (FSC) has a malfunction
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*1 :For the warning display content on the multi-information display, refer to the [MULTI-INFORMATION DISPLAY]. (See
MULTI-INFORMATION DISPLAY.)
*2 :For the warning display content on the center display, refer to the [CENTER DISPLAY] in the workshop manual.
System wiring diagram
Block diagram
Operation
Low beam switching operation
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• When any of the following conditions is met while the headlights are turned on with the light switch in the AUTO position and the dimmer switch in the LO position, the headlights HI turn off.
Operation conditions
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― Vehicles ahead, street lights (driving in city/town) are recognized
― Vehicle speed is 20 km/h {12 mph} or less (vehicle speed signal of 20 km/h {12 mph} or less is received)
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Note
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• When the high beam control (HBC) switch is operated while the high beam control (HBC) system is operating, the high beam control (HBC) system turns off. (Headlights HI turn off)
• When the high beam control (HBC) switch is operated while the high beam control (HBC) system is not operating, the high beam control (HBC) system turns on. (Headlights HI turn on according to surrounding conditions)
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1. When the operation conditions are met, the body control module (BCM) sends (1) a headlight HI off request to the light control module (LCM) via CAN communication.
2. When the light control module (LCM) receives the headlight HI off request signal, it turns the headlights HI off (2).
High beam return operation
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• When the following condition is met, the headlights HI turn on.
Operation conditions
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― Vehicle speed is 30 km/h {19 mph} or more (vehicle signal of 30 km/h {19 mph} or more is received) and vehicles ahead or street lights (driving in city/town) are no longer recognized by forward sensing camera (FSC)
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On-coming vehicles
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1. The body control module (BCM), based on the object information from the forward sensing camera (FSC), sends (1) a headlight HI on request signal to the light control module (LCM) via CAN communication when a recognized on-coming vehicle moves away from the camera range.
2. When the light control module (LCM) receives the headlight HI on request signal, it turns the headlights HI on (2).
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Vehicles ahead or street lights (driving in city/town)
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1. If the body control module (BCM), based on the object information from the forward sensing camera (FSC), determines that a recognized vehicle ahead moves away from the camera range or street lights (driving in city/town) in the camera range are no longer detected, it maintains (1) the headlights LO on condition for a certain period of time.
2. The body control module (BCM), based on the object information from the forward sensing camera (FSC), sends (2) a headlight HI on request signal to the light control module (LCM) via CAN communication if it does not detect vehicles ahead or street lights (driving in city/town) after the certain period of time has elapsed.
3. When the light control module (LCM) receives the headlight HI on request signal, it turns the headlights HI on (3).
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• If the forward sensing camera (FSC) loses sight of a recognized vehicle which is cornering, the body control module (BCM) maintains the headlights LO on condition for a certain period of time.
• If the vehicle ahead is not detected after a certain period of time has elapsed, the headlights HI are turned on, and if a vehicle ahead is detected, the body control module (BCM) maintains the headlights LO on condition.
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FSC suddenly loses sight of light-emitting object within camera range (vehicles ahead, town/city streets (street lights))
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• If the forward sensing camera (FSC) suddenly loses sight of a recognized light-emitting object in the camera range, the headlights LO on condition is maintained for a certain period of time.
• Depending on whether a light-emitting object is detected or not after the certain period of time has elapsed, the body control module (BCM) determines that the headlights HI are to be turned on.
