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:

Component parts	Signal description
BCM	BCM transmits the sleep wake up signal (sleep) to each unit according to the vehicle status. BCM transmits the sleep wake up signal (wake up) to each unit according to the vehicle status. 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.
IPDM E/R	Transmits the sleep-ready signal (ready) to the BCM according to the unit status. Transmits the wake up signal to the BCM according to the unit status. Receives the sleep wake up signal (sleep) from the BCM via CAN communication. Receives the sleep wake up signal (wake up) from the BCM via CAN communication.
Combination meter

OUTLINE 

• BCM incorporates a power consumption 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 (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 

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 20 ms interval.

Sleep mode activation 

• BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter 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 Ignition switch: OFF Vehicle security system alarm: No operation Warning lamp: No operation Warning chime: No operation Stop lamp switch: OFF Hazard warning lamp: No operation Exterior lamp: OFF Door lock status: No change for 2 seconds CONSULT communication status: No communication Door switch status: No change for 2 seconds	The controls only BCM are completed. (Interior room lamp battery saver: Time out etc.)

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 via CAN communication by receiving sleep wake up signals. Each unit transmits wake up signals to BCM via CAN communication to convey the start of CAN communication.

BCM wake-up condition
Ignition switch: OFF ->ACC or ON Stop lamp switch: ON (depress brake pedal) Any door switch: OFF -> ON Lighting switch: OFF ->1ST or PASS Hazard switch: OFF -> ON Remote keyless entry receiver: Receiving