System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

INPUT SIGNAL AND OUTPUT SIGNAL 

Major signal transmission between each unit via communication is shown in the following table:

Component parts	Signal description
BCM	BCM receives the sleep-ready signal (ready) from each unit via CAN communication. BCM receives the wake-up signal from each unit via CAN communication. BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are fulfilled. BCM transmits the sleep wake-up signal (wake up) to each unit when all of the CAN sleep conditions are fulfilled.
IPDM E/R	Each unit transmits the sleep-ready signal (ready) to the BCM when all of the CAN sleep conditions are fulfilled. Each unit transmits the wake-up signal to the BCM when all of the CAN sleep conditions are fulfilled. Each unit receives the sleep wake up signal (sleep) from BCM via CAN communication. Each unit receives the sleep wake-up signal (wake up) from BCM via CAN communication.
Combination meter

OUTLINE 

• The BCM incorporates a power saving control function that reduces the power consumption according to the vehicle status.
• The BCM switches the status (control mode) by itself with the power saving control function. It performs the sleep request to each unit (IPDM E/R and combination meter) that operates with the ignition switch OFF.

  Normal mode (wake-up):

  • CAN communication with other units is normal
  • BCM controls are operating properly

  CAN communication sleep mode (CAN sleep):

  • CAN transmission is stopped
  • Only BCM controls are operating

  Low power consumption mode (BCM sleep)

  • Low power consumption control is active
  • CAN transmission is stopped

LOW POWER CONSUMPTION CONTROL WITH BCM 

The BCM reduces the power consumption with the following operation in the low power consumption mode:

• The reading interval of each switch changes from 10 ms interval to 60 ms interval.

SLEEP MODE ACTIVATION 

• The BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communication.
• The BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are fulfilled.
• Each unit stops the transmission of CAN communication with the sleep wake-up signal. BCM is in CAN communication sleep mode.
• The BCM is in the low power consumption mode and performs low power consumption control when all of the BCM sleep conditions are fulfilled with CAN sleep condition.

CAN sleep condition

BCM sleep condition

Receiving the sleep-ready signal (ready) from all units Ignition switch: OFF Vehicle security system alarm and panic alarm: No operation Warning lamp: No operation Intelligent Key warning buzzer: No operation Stop lamp switch: OFF Brake pedal position switch: OFF Turn signal indicator lamp: No operation Exterior lamp: OFF Door lock status: No change CONSULT communication status: No communication Meter display signal: Non-transmission Door switch status: No change Rear window defogger: OFF

Interior room lamp battery saver: Time out RAP system: OFF Push-button ignition switch illumination: OFF NATS: No operation Tire pressure monitoring system: Stop

WAKE-UP OPERATION 

• The BCM transmits the sleep wake-up signal (wake up) to each unit when any of the CAN wake-up conditions are fulfilled. It changes from the low power consumption mode or the CAN communication sleep mode to the normal mode.
• Each unit starts the transmission of CAN communication with the sleep wake-up signal. In addition, the combination meter transmits the wake-up signal to the BCM via CAN communication to report the CAN communication start.

BCM wake-up condition

CAN wake-up condition

Front door lock assembly LH (door unlock sensor): Lock or unlock Door lock switch: OFF→ON Door unlock switch: OFF→ON Trunk lid opener switch: OFF→ON

Receiving the sleep-ready signal (Not-ready) from any units Push-button ignition switch: OFF→ON Hazard switch: OFF→ON PASSING switch: OFF→ON, ON→OFF TAIL LAMP switch: OFF→ON Front door switch LH: OFF→ON, ON→OFF Front door switch RH: OFF → ON, ON → OFF Trunk lid opener switch: OFF→ON, ON→OFF Front outside handle LH (request switch): OFF→ON Front outside handle RH (request switch): OFF→ON Trunk opener request switch: OFF→ON Stop lamp switch signal: ON