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Home >> Infiniti >> 2009 >> FX35 AWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security Control System >> Component Diagnosis >> DTC B261A: Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. INSPECTION START

    Check the case in which DTC is detected.

    • Case 1: It is detected when push-button ignition switch is pressed for 1 second
    • Case 2: It is detected after Intelligent Key is inserted into key slot and push-button ignition switch is pressed

    In which case is DTC detected? 

    Case 1: GO TO 2.

    Case 2: GO TO  4.

  2. CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 1
    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch connector and IPDM E/R connector E5.
    3. Check voltage between push-button ignition switch harness connector and ground.
    CONNECTOR TERMINAL VOLTAGE CHART

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

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 3.

  3. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT 1
    1. Disconnect BCM connector M122.
    2. Check continuity between push-button ignition switch harness connector and BCM harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

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

    Push-button ignition switch Ground Continuity
    Connector Terminal
    M50 4 Not existed

    Is the inspection result normal? 

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

    NO: Repair or replace harness.

  4. CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 2
    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch connector and BCM connector M122.
    3. Check voltage between push-button ignition switch harness connector and ground.
    CONNECTOR TERMINAL VOLTAGE CHART

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

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT 2
    1. Disconnect IPDM E/R connector E5.
    2. Check continuity between push-button ignition switch harness connector and IPDM E/R harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

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

    Push-button ignition switch Ground Continuity
    Connector Terminal
    M50 4 Not existed

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness.

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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