POWER CONSUMPTION CONTROL SYSTEM : System Description

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 (IPDM E/R, combination meter and multi control 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 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.

  Sleep condition

  BCM AND CAN SLEEP CONDITION CHART
  
  

  CAN sleep condition	BCM sleep condition
  Receiving the sleep-ready signal (ready) from all units 1 minute after turning ignition switch OFF Theft warning alarm and panic alarm: Not operation Warning chime: Not operation Stop lamp switch: OFF Turn signal indicator lamp: Not operation Exterior lamp: OFF Door lock status: No change CONSULT-III communication status: Not communication Door switch status: No change Driver door lock status: No change Key switch status: No change	Interior room lamp battery saver: Time out(1) RAP system: No communication Nissan anti-theft system (NATS): Not operation Remote keyless entry receiver communication status: No communication Tire pressure monitoring system (TPMS): Stop
  (1) Refer to "Interior Room Lamp Battery Saver System : System Description " for details of the interior room lamp battery saver time.

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.

  Wake-up condition

  WAKE-UP CONDITION CHART
  
  

  Wake-up condition

  Receiving the sleep-ready signal (Not-ready) from any units Ignition switch: OFF → ACC, ON Key switch: OFF → ON, ON → OFF Hazard switch: 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 FR FOG switch: OFF → ON, ON → OFF TURN RH: OFF → ON, ON → OFF TURN LH: OFF → ON, ON → OFF Driver door switch: OFF → ON, ON → OFF Passenger door switch: OFF → ON, ON → OFF Rear RH door switch: OFF → ON, ON → OFF Rear LH door switch: OFF → ON, ON → OFF Back door switch: OFF → ON, ON → OFF Back door opener switch: OFF → ON Stop lamp switch: ON Door lock and unlock switch: NEUTRAL → LOCK, NEUTRAL → UNLOCK Front door lock assembly (driver side) (unlock sensor): OFF → ON, ON → OFF Front door lock assembly (driver side) (door key cylinder switch): NEUTRAL → LOCK, NEUTRAL → UNLOCK Remote keyless entry receiver communication: Receiving