2003 Nissan-Datsun Sentra SE-R, StandardFACTORY OEM SERVICE PROCEDURE

Low Power Consumption Control With BCM

WARNING: This page is about a different car, the 2011 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

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.

Sleep condition

CAN AND BCM 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
  • Key switch status: No change for 2 seconds
  • Hazard warning lamp: No operation
  • Exterior lamp: OFF
  • Door lock status: No change for 2 seconds
  • CONSULT-III 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 with CAN communication by receiving sleep wake up signals. Each unit transmits wake up signals to BCM with CAN communication to convey the start of CAN communication.

Wake-up condition

BCM WAKE-UP CONDITION

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
  • Back door opener switch OFF → ON
  • Remote keyless entry receiver: Receiving
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.