System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

INPUT SIGNAL AND OUTPUT SIGNAL 

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

System Description 

OUTLINE 

• The BCM incorporates a power saving control function that reduces 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 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 

The BCM reduces power consumption with the following operation in 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 the 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 wakeup signal.
• The BCM is in low power consumption mode and performs low power consumption control when all of the BCM sleep conditions are fulfilled with CAN sleep condition.

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.