2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Check Key Switch

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. CHECK KEY SWITCH 

    With CONSULT-II 

    Check key switch "IGN KEY SW" in "DATA MONITOR" mode with CONSULT-II.

    1. Key is inserted in ignition key cylinder : IGN KEY SW ON 
    2. Key is removed from ignition key cylinder: IGN KEY SW OFF 
    Fig 1: Display Data Monitor Sheet With Consult-II
    G02022314Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between BCM connector M4 terminal 69 (PU/W) and ground.

    Fig 2: BCM Connector M4 Terminal 69 (PU/W) And Ground Table
    G02022315Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> Key switch is OK.

    NG >> GO TO 2.

    Fig 3: Checking Voltage Between BCM Connector M4 Terminal 69 (PU/W) And Ground
    G02022316Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK KEY SWITCH CIRCUIT 
    1. Disconnect key switch connector.
    2. Check Continuity Between BCM Connector M4 Terminal 69 (PU/W) And Key Switch Connector M64 terminal 4 (PU/W).
      1. 69 (PU/W) - 4 (PU/W) : Continuity should exist. 
    3. Check continuity between BCM connector M4 terminal 69 (PU/W) and ground.
      1. 69 (PU/W) - Ground : Continuity should not exist. 
      Fig 4: Checking Continuity Between BCM Connector And Key Switch Connector
      G02022317Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> GO TO 3.

    NG >> Repair or replace harness.

  3. CHECK KEY SWITCH 

    Check continuity key switch terminals.

    Fig 5: Identifying Continuity Key Switch Terminals Table
    G02022318Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK >> Check the following.

    • 10A fuse [No. 32, located in fuse block (J/B) No.2]
    • Harness for open or short between key switch and fuse

    NG >> Replace key switch.

    Fig 6: Checking Continuity Key Switch Terminals
    G02022319Courtesy of NISSAN MOTOR CO., U.S.A.
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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.