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Home >> Infiniti >> 2012 >> EX35 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Security Control System) >> Component Diagnosis >> DTC B261A: Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.
  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.
      TERMINALS VOLTAGE REFERENCE

      (+) (-) 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.
      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 Not existed

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: Repair or replace harness or connector.

  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.
      TERMINALS VOLTAGE REFERENCE

      (+) (-) 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.
      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 Not existed

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: Repair or replace harness or connector.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END 

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