2011 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Key Switch Check

  1. CHECK KEY SWITCH INPUT SIGNAL

    With CONSULT-III 

    Check key switch "KEY ON SW" in DATA MONITOR mode with CONSULT-III. Refer to "CONSULT-III FUNCTION (BCM) ".

    • When key is inserted into ignition key cylinder:

      KEY ON SW : ON 

    • When key is removed from ignition key cylinder:

      KEY ON SW : OFF 

      Without CONSULT-III 

      Check voltage between BCM connector and ground.

      VOLTAGE AND CONTINUITY SPECIFICATIONS

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M18 37 Ground Key is inserted. Battery voltage
      Key is removed. 0
      Fig 1: Checking Voltage Between BCM Connector Terminal 37 And Ground
      G07140347Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: Key switch circuit is OK.

      NG: GO TO 2.

  2. CHECK KEY SWITCH
    1. Turn ignition switch OFF.
    2. Disconnect key switch connector.
    3. Check key switch.
      VOLTAGE AND CONTINUITY SPECIFICATIONS

      Terminals Condition Continuity
      1 - 2 Key is inserted. Yes
      Key is removed. No
      Fig 2: Checking Key Switch
      G07140348Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: Check the following.

      • 10A fuse [No. 19, located in fuse block (J/B)]
      • Harness for open or short between key switch and fuse
      • Harness for open or short between BCM and key switch

      NG: Replace key switch.

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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.

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