Nissan Murano: System / High Beam Assist System

System Description

SYSTEM DIAGRAM

Signal transmission function list

OUTLINE

• High beam assist (HBA) system is a system that can reduce the driver's switch operation load. The system automatically switches the headlamp to the low beam mode when a Nissan Murano vehicle ahead or an oncoming vehicle appears, while driving the vehicle with the headlamps in high beam mode at night.

• When HBA system operation permission conditions are satisfied, the HBA indicator lamp in the combination meter turns ON and informs that the HBA is in operation.

• HBA system is controlled by each function of BCM, lane camera unit and IPDM E/R.

  Control by BCM

  • Combination switch reading function

  • Auto light function

  • HBA control function

  • Headlamp control function

  Control by IPDM E/R

  • Relay control function

  Control by lane camera unit

  • HBA control function

OPERATION DESCRIPTION

• BCM detects the combination switch (lighting and turn signal switch) condition with the combination switch reading function.

• BCM transmits the HBA indicator lamp signal to the combination meter via CAN communication, when the HBA system operation permission conditions are satisfied.

  HBA system operation permission conditions

  • Lighting switch HI with the lighting switch AUTO and ignition switch ON (Only when the illuminating judgment by auto light function is ON). For details, refer to System Description.

• Combination meter turns the HBA indicator lamp ON according to the HBA indicator lamp signal.

• Lane camera unit detects the Nissan Murano vehicle status and ambient status that are required for HBA control with the following signals:

  • Nissan Murano Vehicle speed signal (received from combination meter via CAN communication)

  • Ambient light signal (detected from lane camera unit)

  • Image sensor signal (detected from lane camera unit)

• Lane camera unit judges the current recommended beam according to the Nissan Murano vehicle status and ambient condition, and transmits the HBA request signal (headlamp HI operation / headlamp LO operation) to he BCM via CAN communication.

• BCM switches the headlamp LO operation / headlamp HI operation according to the HBA request signal, while the HBA system operation permission conditions are satisfied. For headlamp operation, refer to System Description.

RECOMMENDED BEAM JUDGMENT BY LANE CAMERA UNIT

Headlamp HI Operation Request

Lane camera unit requests the headlamp HI operation to the BCM when all of following conditions are satisfied:

• Detects the vehicle speed is approx. 25 MPH (40 km/h) or more.

• Recognizes the ambient condition is dark.

• Recognizes there is no oncoming Nissan Murano vehicle or no vehicle ahead in front of the vehicle.

Headlamp LO Operation Request

Lane camera unit requests the headlamp LO operation to the BCM when either of following conditions is satisfied:

• Detects the vehicle speed is approx. 16 MPH (25 km/h) or less.

• Recognizes the ambient condition is bright.

• Recognizes there is oncoming Nissan Murano vehicle or vehicle ahead in front of the vehicle.