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Home › Infiniti › 2012 › FX35 AWD › Repair and Diagnosis › Body & Frame › Door Locks › Security Control System › DTC/Circuit Diagnosis › DTC B261A: Push-Button Ignition Switch › Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START

    Check the case in which DTC is detected.

    • Case1: It is detected when push-button ignition switch is pressed for 1 second
    • Case2: It is detected after Intelligent Key is inserted into key slot and push-button ignition switch is pressed

      In which case is DTC detected? 

      Case1: GO TO 2.

      Case2: 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.
      (+) (-) 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.
      Push-button ignition switch BCM Continuity
      Connector Terminal Connector Terminal
      M50 4 M121 60 Existed
    3. Check continuity between push-button ignition switch harness connector and ground.
      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.
      (+) (-) 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.
      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.
      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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