System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

Component	Function
BCM	BCM transmits sleep wake up signal to each unit when condition is established, and then goes into each mode.
Combination meter	Transmits the sleep-ready signal and wake up signal to BCM via CAN communication. Receives the sleep wake up signal from BCM via CAN communication.
IPDM E/R
TCU
Electric shift control module	Transmits the sleep-ready signal to BCM via CAN communication. Receives the sleep wake up signal from BCM via CAN communication.
TCM (transmission control module)
AV control unit	Receives the sleep wake up signal from BCM via CAN communication.
Each switch	Each switch transmits the vehicle status to BCM.

OUTLINE 

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

  Normal mode (wake-up)

  • CAN communication is normally performed with other units
  • Each control with BCM is operating properly

  CAN communication sleep mode (CAN sleep)

  • CAN transmission is stopped
  • Control with BCM only is operating

  Low power consumption mode (BCM sleep)

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

LOW POWER CONSUMPTION CONTROL WITH BCM 

BCM reduces the power consumption with the following operation in the low power consumption mode.

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

Sleep mode activation 

• BCM receives the sleep-ready signal (ready) 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.
• Each unit stops the transmission of CAN communication with the sleep wake up signal. BCM is in CAN communication sleep mode.
• BCM is in the low power consumption mode and perform the 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 1 minute after turning Ignition switch OFF Warning chime: Not operation Intelligent Key warning buzzer: Not operation Stop lamp switch: OFF Turn signal indicator lamp: Not operation Exterior lamp: OFF Door lock status: No change CONSULT communication status: Not communication Meter display signal: Non-transmission Door switch status: No change

Interior room lamp battery saver: Time out * Nissan Vehicle Immobilizer System (NVIS): Not operation Remote keyless entry receiver communication status: No communication Retained power function: OFF

Wake-up operation 

• BCM transmits sleep wake up signal (wake up) to each unit when any condition listed below is established, and then goes into normal mode from low power consumption mode.
• Each unit starts transmissions with CAN communication by receiving sleep wake up signals. Each unit transmit wake up signals to BCM with CAN communication to convey the start of CAN communication.

BCM wake-up condition

CAN wake-up condition

Door key cylinder switch: NEUTRAL → LOCK, NEUTRAL → UNLOCK Door lock and unlock switch: NEUTRAL → LOCK, NEUTRAL → UNLOCK Extended storage fuse switch: OFF → ON, ON → OFF Door lock assembly (driver side) (unlock sensor): OFF → ON, ON → OFF

Receiving the sleep-ready signal (Not-ready) from any units Push-button ignition switch (push switch): OFF→ ON Hazard switch: OFF → ON HI BEAM switch: OFF → ON, ON → OFF PASSING switch: OFF → ON, ON → OFF HEADLAMP 1 switch: OFF → ON, ON → OFF HEADLAMP 2 switch: OFF → ON, ON → OFF TAIL LAMP switch: OFF → ON RR FOG switch: OFF → ON Driver door switch: OFF → ON, ON → OFF Passenger door switch: OFF → ON, ON → OFF Luggage room lamp switch: OFF → ON, ON → OFF Driver door request switch: OFF → ON Passenger door request switch: OFF → ON Back door opener switch: OFF → ON Back door opener request switch: OFF → ON Stop lamp switch: ON Remote keyless entry receiver communication: Receiving