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

Communication System C

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONNECTOR INSPECTION 

    Check the terminals (at the control unit and harness) on BCM and LCU for disconnection, bend and other malfunctions.

    OK or NG 

    OK >> GO TO 2.

    NG >> Repair terminals and connectors.

  2. BCM INSPECTION 

    Replace the BCM with a known-good one, and perform the communication diagnosis. Refer to "IVMS COMMUNICATION INSPECTION  " (with CONSULT-II), "COMMUNICATION DIAGNOSIS  " (without CONSULT-II).

    OK or NG 

    OK >> Replace BCM

    NG >> Repair communication harness between LCU and BCM.

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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.