2008 Infiniti M45 BaseFACTORY OEM SERVICE PROCEDURE

Check Key Switch Built In Key Slot

  1. CHECK FUNCTION 

    When the driver door is opened while inserting the Intelligent Key into the key slot, make sure that key reminder warning functions properly.

    Key inserted : Sound 

    Key removed : No sound 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 2.

  2. CHECK POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect key slot connector.
    3. Check voltage between key slot connector and ground.
      TERMINAL VOLTAGE CHART

      Terminals Voltage (V) (Approx.)
      (+) (-)
      Key slot connector Terminal
      M14 1 Ground Battery voltage

    OK or NG 

    OK: GO TO 3.

    NG: Check key slot power supply circuit for open or short.

    Fig 1: Checking Voltage Between Key Slot Connector Terminal 1 And Ground
    G05212361Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS CONTINUITY 1 
    1. Disconnect Intelligent Key unit connector.
    2. Check continuity between Intelligent Key unit connector and key slot connector.
      TERMINAL CONTINUITY CHART

      A B Continuity
      Intelligent Key unit connector Terminal Key slot connector Terminal
      M32 19 M14 2 Yes
    3. Check continuity between Intelligent Key unit connector and ground.
      Fig 2: Checking Continuity Between Intelligent Key Unit Connector And Key Slot Connector
      G05212362Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINAL CONTINUITY CHART

      A Ground Continuity
      Intelligent Key unit connector Terminal
      M32 19 No

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace harness.

  4. CHECK KEY SLOT 

    Check key slot.

    TERMINAL REFERENCE CHART

    Terminal Condition Continuity
    Key slot
    1 2 Key slot inserted Yes
    Key slot removed No

    OK or NG 

    OK: Check the condition of harness and connector.

    NG: Replace key slot.

    Fig 3: Checking Key Slot
    G05212363Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK HARNESS CONTINUITY 2 
    1. Disconnect BCM connector.
    2. Check continuity between BCM connector and key slot connector.
      TERMINAL CONTINUITY CHART

      A B Continuity
      BCM connector Terminal Key slot connector Terminal
      M1 37 M14 2 Yes
    3. Check continuity between BCM connector and ground.
      Fig 4: Checking Continuity Between BCM Connector And Key Slot Connector
      G05212364Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINAL CONTINUITY CHART

      A Ground Continuity
      BCM connector Terminal
      M1 37 No

    OK or NG 

    OK: Replace BCM. Refer to "C/U INITIALIZATION", and then perform the registration again after replacing BCM.

    NG: Repair or replace harness.

Chapter Navigation
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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.