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Home >> Infiniti >> 2007 >> G35 x >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security Control System (Sedan) >> Intelligent Key System >> Component 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 harness connector and IPDM E/R harness connector E5.
    3. Check voltage between push-button ignition switch harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      Push-button ignition switch Ground Voltage (V)
      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. Disconnect BCM harness connector.
    2. Check continuity between push-button ignition switch harness connector and BCM harness connector.
      TERMINALS CONTINUITY REFERENCE

      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.
      TERMINALS CONTINUITY REFERENCE

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

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: Repair harness or connector.

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

      Push-button ignition switch Ground Voltage (V)
      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
    1. Disconnect IPDM E/R harness connector.
    2. Check continuity between push-button ignition switch harness connector and IPDM E/R harness connector.
      TERMINALS CONTINUITY REFERENCE

      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.
      TERMINALS CONTINUITY REFERENCE

      Push-button ignition switch Ground Continuity
      Connector Terminal
      M50 4 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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