2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Communication System A

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. BCM INSPECTION 

    Replace the malfunctioning 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 >> GO TO 2.

  2. LCU INSPECTION 
    1. Replace with the previously installed BCM.
    2. Replace the LCU 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 LCU.

    NG >> Repair or replace harness.

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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.