2009 Infiniti M45 BaseFACTORY OEM SERVICE PROCEDURE

Check Push-Button Ignition Switch

  1. CHECK POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch connector.
    3. Check voltage between push-button ignition switch connector and ground.
    VOLTAGE REFERENCE CHART

    Terminals Voltage (V) (Approx.)
    (+) (-)
    push-button ignition switch connector Terminal
    M27 4 Ground Battery voltage
    Fig 1: Checking Voltage Between Push-Button Ignition Switch Connector And Ground
    G05212348Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

    NG: GO TO  2.

  2. CHECK HARNESS CONTINUITY
    1. Disconnect Intelligent Key unit connector.
    2. Check continuity between Intelligent Key unit connector and push-button ignition switch connector.
      CONTINUITY REFERENCE CHART

      A B Continuity
      Intelligent Key unit connector Terminal push-button ignition switch connector Terminal
      M32 39 M27 4 Yes
    3. Check continuity between Intelligent Key unit connector and ground.
    Fig 2: Checking Continuity Between Intelligent Key Unit And Push-Button Ignition Switch Connector
    G05212333Courtesy of NISSAN MOTOR CO., U.S.A.
    CONTINUITY REFERENCE CHART

    A Ground Continuity
    Intelligent Key unit connector Terminal
    M32 39 No

    OK or NG 

    OK: GO TO  3.

    NG: Repair or replace harness.

  3. CHECK PUSH-BUTTON IGNITION SWITCH

    Check push-button ignition switch.

    CONTINUITY REFERENCE CHART

    Terminal Push-button ignition switch condition Continuity
    Push-button ignition switch
    1 4 Pushed Yes
    Released No
    Fig 3: Checking Push-Button Ignition Switch
    G05212334Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: Replace push-button ignition switch.

  4. CHECK GROUND CIRCUIT

Check push-button ignition switch connector.

CONTINUITY REFERENCE CHART

Push-button ignition switch connector Terminal Ground Continuity
M27 1 Yes

OK or NG 

OK: Check the condition of harness and connector.

NG: Repair or replace harness.

Fig 4: Checking Push-Button Ignition Switch Connector
G05212351Courtesy 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.