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Home >> Infiniti >> 2008 >> EX35 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> 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.
      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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