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Home >> Infiniti >> 2010 >> M35 x >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Body, Lock & Security System >> Service Information >> Intelligent Key System/Engine Start Function >> DTC B2556: Eng Start SW >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK HARNESS CONTINUITY
    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit and push-button ignition switch connector.
    3. Check continuity between Intelligent Key unit connector and push-button ignition switch connector.
      CONTINUITY REFERENCE CHART

      A B Continuity
      Intelligent Key unit connector Terminal Push-button ignition switch connector Terminal
      M32 39 M27 4 Yes
      Fig 1: Checking Continuity Between Intelligent Key Unit And Push-Button Ignition Switch Connector
      G05212333Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between Intelligent Key unit connector and ground.
    CONTINUITY REFERENCE CHART

    A Ground Continuity
    Intelligent Key unit connector Terminal
    M32 39 No

    OK or NG 

    OK: GO TO  2.

    NG: Repair or replace harness.

  2. CHECK PUSH-BUTTON IGNITION SWITCH

    Check push-button ignition switch.

    CONTINUITY REFERENCE CHART

    Terminal Push-button ignition switch condition Continuity
    Push-button ignition switch
    1 4 Pushed Yes
    Released No
    Fig 2: Checking Push-Button Ignition Switch
    G05212334Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Check the condition of harness and connector. If it is OK, check the self-diagnosis results using CONSULT-III again.

    NG: Replace push-button ignition switch.