System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN

OUTLINE 

BCM incorporates a power saving control function that reduces the power consumption according to the vehicle status. Low power consumption mode (sleep)

• CAN transmission is stopped to other units
• Each control with BCM is operating low power consumption mode

Normal mode (wake-up)

• CAN communication is normally performed
• Each control with BCM is operating normally

Low power consumption mode activation 

• BCM receives the sleep-ready signal from each unit via CAN communication.
• BCM transmits the sleep wake up signal (sleep) to each unit when receive the sleep-ready signal from each unit.
• Each unit stops the transmission of CAN communication with the sleep wake up signal (sleep).
• BCM perform the low power consumption control when fulfilled with all sleep conditions.

  Sleep condition
  Ignition switch OFF (not auto ACC status) Interior room lamp power supply OFF Navigation and audio system OFF

Wake-up operation 

• BCM transmits sleep wake up signal (wake up) to each unit when sleep conditions change, and then goes into normal mode from low power consumption mode.
• Each unit starts transmissions with CAN communication by receiving sleep wake up signal (wake up).
• BCM stop the low power consumption control when fulfilled with any wake up conditions.

  Wake up condition
  Ignition switch OFF -> ON Door closed -> opened Door lock / unlock operation