2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

BCM Circuit Check

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTOR 
    1. Turn ignition switch OFF.
    2. Disconnect the negative battery terminal.
    3. Check the terminals and connector of BCM for damage, bent or loose connection (control module-side and harness-side).

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Repair terminal or connector.
  2. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Disconnect BCM connector.
    2. Check resistance between BCM harness connector M18 terminals 70 (L) and 71 (Y).

      70 (L) - 71 (Y) : Approx. 54 - 66Ω 

    OK or NG 

    1. OK: Replace BCM.
    2. NG: Repair harness between harness connector M7 and BCM.
    Fig 1: Checking Resistance Between BCM Harness Connector M18 Terminals 70 (L) And 71 (Y)
    G02163048Courtesy of NISSAN MOTOR CO., U.S.A.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.