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Home >> Infiniti >> 2012 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Power Control System -- G37 Convertible) >> Power Distribution System >> DTC/Circuit Diagnosis >> Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti G37. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL
    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch connector and IPDM E/R connector.
    3. Check voltage between push-button ignition switch harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      (+) (-) Voltage (V) (Approx.)
      Push-button ignition switch
      Connector Terminal
      M50 4 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT
    1. Disconnect BCM connector.
    2. Check continuity between BCM harness connector and push-button ignition switch harness connector.

      With steering lock unit

      TERMINAL CONTINUITY REFERENCE CHART

      BCM Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      M122 89 M50 4 Existed

      Without steering lock unit

      TERMINAL CONTINUITY REFERENCE CHART

      BCM Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      M121 60 M50 4 Existed
    3. Check continuity between BCM harness connector and ground.

      With steering lock unit

      TERMINAL CONTINUITY REFERENCE CHART

      BCM Ground Continuity
      Connector Terminal
      M122 89 Not existed

      Without steering lock unit

      TERMINAL CONTINUITY REFERENCE CHART

      BCM Ground Continuity
      Connector Terminal
      M121 60 Not existed

      Is the inspection result normal? 

      YES: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

  3. CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT

    Check continuity between push-button ignition switch harness connector and ground.

    TERMINAL CONTINUITY REFERENCE CHART

    Push-button ignition switch Ground Continuity
    Connector Terminal
    M50 1 Existed

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace harness.

  4. CHECK PUSH-BUTTON IGNITION SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace push-button ignition switch. Refer to "REMOVAL AND INSTALLATION ".

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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