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Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Security Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B261A: Push-Button Ignition Switch >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX50. However, it is still accessible from the selected car via links, so may be relevant.

  1. INSPECTION START

    Perform inspection in accordance with procedure that confirms DTC.

    Which procedure confirms DTC?

    DTC confirmation procedure 1 

    GO TO STEP 2  .

    DTC confirmation procedure 2 

    GO TO STEP 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.
    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 STEP 6  .

    NO 

    GO TO STEP 3  .

  3. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT 1

    1. Disconnect BCM connector.
    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 M122 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 

    GO TO STEP 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.
    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 STEP 6  .

    NO 

    GO TO STEP 5  .

  5. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT 2

    1. Disconnect IPDM E/R connector.
    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 

    GO TO STEP 6  .

    NO 

    Repair or replace harness or connector.

  6. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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