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Home › Infiniti › 2015 › QX80 Base, AWD › Repair and Diagnosis › Electrical › Body Electrical › Power Control System (Power Distribution System) › DTC/Circuit Diagnosis › DTC B261A: Push-Button Ignition Switch › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK IGNITION SWITCH OUTPUT SIGNAL (PUSH-BUTTON IGNITION SWITCH)

    1. Disconnect push-button ignition switch connector and IPDM E/R connector.
    2. Check voltage between push-button ignition switch harness connector and ground.
      (+) (-) Voltage (V)
      (Approx.)
      Push-button ignition switch
      Connector Terminal
      M101 4 Ground 12

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 2  .

  2. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (BCM)

    1. Disconnect BCM connector.
    2. Check continuity between BCM harness connector and push-button ignition switch harness connector.
      BCM Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      M71 100 M101 4 Existed
    3. Check continuity between push-button ignition switch harness connector and ground.
      Push-button ignition switch Ground Continuity
      Connector Terminal
      M101 4 Not existed

    Is the inspection result normal?

    YES 

    Replace BCM. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace harness.

  3. CHECK IGNITION SWITCH OUTPUT SIGNAL (IPDM E/R)

    Check voltage between IPDM E/R harness connector and ground.

    (+) (-) Voltage (V)
    (Approx.)
    IPDM E/R
    Connector Terminal
    E17 66 Ground 12

    Is the inspection result normal?

    YES 

    Replace IPDM E/R.

    NO 

    GO TO STEP 4  .

  4. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (IPDM E/R)

    1. Disconnect IPDM E/R connector.
    2. Check continuity between IPDM E/R harness connector and push-button ignition switch harness connector.
      IPDM E/R Push-button ignition switch Continuity
      Connector Terminal Connector Terminal
      E17 66 M101 4 Existed
    3. Check continuity between push-button ignition switch harness connector and ground.
      Push-button ignition switch Ground Continuity
      Connector Terminal
      M101 4 Not existed

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace harness.

  5. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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