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System Description
 
 
SYSTEM DIAGRAM
ComponentFunction
BCMBCM transmits sleep wake up signal to each unit when condition is established, and then goes into each mode.
AV control unit
  • Transmits the sleep-ready signal to BCM via CAN communication.
  • Receives the sleep wake up signal from BCM via CAN communication.
Chassis control module
Combination meter
Driver seat control unit
Keyless operation key unit
IPDM E/R
TCU
BOSE speaker amp.Transmits the sleep-ready signal to BCM via CAN communication.
ABS actuator and electric unit (control unit)Receives the sleep wake up signal from BCM via CAN communication.
Automatic power liftgate control unit
Electric shift control module
Each switchEach 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.
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 light 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