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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Control System >> Power Distribution System >> Component Diagnosis >> DTC B261A: Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK PUSH-BUTTON IGNITION SWITCH OPERATION

    Press push-button ignition switch and check if it turns to ON.

    Does ignition switch turn to ON? 

    YES: GO TO 2.

    NO: GO TO  4.

  2. CHECK IGNITION SWITCH OUTPUT SIGNAL (IPDM E/R)
    1. Disconnect push-button ignition switch harness connector.
    2. Check voltage between IPDM E/R harness connector and ground.
      VOLTAGE SPECIFICATION

      IPDM E/R Ground Voltage [V]
      Connector Terminal
      E5 28 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Replace IPDM E/R. Refer to , "REMOVAL AND INSTALLATION ".

  3. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (IPDM E/R)
    1. Disconnect IPDM E/R harness connector E5 and BCM harness connector M122.
    2. Check continuity between IPDM E/R harness connector and push-button ignition switch harness connector.
      CONTINUITY SPECIFICATION

      IPDM E/R Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      E5 28 M50 4 Existed
    3. Check continuity between IPDM E/R harness connector and ground.
      CONTINUITY SPECIFICATION

      IPDM E/R Ground Continuity
      Connector Terminal
      E5 28 Ground Not existed

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: Repair harness or connector.

  4. CHECK IGNITION SWITCH OUTPUT SIGNAL (BCM)
    1. Disconnect push-button ignition switch harness connector.
    2. Check voltage between BCM harness connector and ground.
      VOLTAGE SPECIFICATION

      BCM Ground Voltage [V]
      Connector Terminal
      M122 89 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

  5. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (BCM)
    1. Disconnect BCM harness connector and IPDM E/R harness connector.
    2. Check continuity between BCM harness connector and push-button ignition switch harness connector.
      CONTINUITY SPECIFICATION

      BCM Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      M122 89 M50 4 Existed
    3. Check continuity between BCM harness connector and ground.
      CONTINUITY SPECIFICATION

      BCM Ground Continuity
      Connector Terminal
      M122 89 Ground Not existed

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair harness or connector.

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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