System Description

SYSTEM DIAGRAM

Component		Function
Optical sensor		Refer to Optical Sensor.
Front camera unit		Judges the vehicle status from each signal in order to control the high beam assist control.
IPDM E/R		Transmits the control signal and request (via LIN communication) to the load according with the request from BCM via CAN communication.
BCM		Detects each switch condition by the combination switch reading function. Exterior light ON/OFF is judged from each signal, and then a request is transmitted to IPDM E/R (via CAN communication) to controls each lamps. It also transmits a status to the combination meter (via CAN communication) to turns indicator light ON/OFF.
Combination meter		Turns the indicator light ON/OFF according to the status from BCM via CAN communication.
ABS actuator and electric unit (control unit)		ABS actuator and electric unit (control unit) transmits vehicle speed signal to front camera unit via CAN communication.
Combination switch	Lighting & turn signal switch	Inputs the each switch condition signal to BCM.

OUTLINE

High beam assist system is a system that can reduce the driver's switch operation load. The system automatically switches the headlight to the low beam mode when a vehicle ahead or an oncoming vehicle appears, while driving the vehicle with the headlamps in high beam mode at night.
When the high beam assist system operation permission conditions are satisfied, the high beam assist indicator light in the combination meter turns ON and informs that the high beam assist is in operation.
High beam assist system is controlled by each function of BCM, IPDM E/R and front camera unit.
Control by BCM
- Combination switch reading function
- Auto light function
- High beam assist control function
- Headlight control function
Control by IPDM E/R
- Smart FET control function
- LIN communication function
Control by front camera unit
- High beam assist control function

OPERATION DESCRIPTION

BCM detects the combination switch condition with the combination switch reading function.
BCM transmits the high beam assist indicator signal to the combination meter via CAN communication when the high beam assist system operation permission conditions are satisfied.
High beam assist system operation permission conditions (when all of following conditions are satisfied)
- Ignition switch ON
- Lighting switch AUTO (Only when the illuminating judgement by auto light function is ON. Refer to System Description. ) (Except for Canada)
- Lighting switch AUTO or 1ST (Only when the illuminating judgement by auto light function is ON. Refer to System Description. ) (For for Canada)
- High beam assist switch ON
Combination meter turns the high beam assist indicator light ON according to the high beam assist indicator signal.
Front camera unit detects the vehicle status and ambient status that are required for high beam assist control with the following signals.
- Vehicle speed signal [received from ABS actuator and electric unit (control unit) via CAN communication]
- Ambient light signal (detect from front camera unit)
- Image sensor signal (detect from front camera unit)
Front camera unit judges the current recommended beam according to the vehicle status and ambient condition, and transmits the high beam assist request signal (headlight HI operation / headlight LO operation) to BCM via CAN communication.
BCM switches the headlight LO operation / headlight HI operation according to high beam assist request signal while the high beam assist system operation permission conditions are satisfied. For headlight operation, refer to System Description.

RECOMMENDED BEAM JUDGEMENT BY FRONT CAMERA UNIT

Headlight HI Operation Request

Front camera unit requests the headlight HI operation to BCM when all of following conditions are satisfied.

Detects the vehicle speed is approx. 30 km/h (19 MPH) or more.
Recognizes the ambient condition is dark.
Recognizes there is no oncoming vehicle or no vehicle ahead in front of the vehicle.

Headlight LO Operation Request

Front camera unit requests the headlight LO operation to BCM when either of following conditions is satisfied.

Detects the vehicle speed is approx. 20 km/h (13 MPH) or less.
Recognizes the ambient condition is bright.
Recognizes there is oncoming vehicle or vehicle ahead in front of the vehicle.