LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2017 >> Sentra Nismo, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Security Control System (With Intelligent Key System) (DTCS)) >> DTC/Circuit Diagnosis >> DTC B2556: Push-Button Ignition Switch >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

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

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  1. CHECK PUSH-BUTTON IGNITION SWITCH INPUT SIGNAL

    1. Turn ignition switch OFF.
    2. Disconnect push-button ignition switch connector.
    3. Check voltage between push-button ignition switch harness connector and ground.
      (+) (-) Voltage (V)
      (Approx.)
      Push-button ignition switch
      Connector Terminal
      M25 8 Ground 12

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 2  .

  2. CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT

    1. Disconnect BCM connector and IPDM E/R 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
      M25 8 M83 55 Yes
    3. Check continuity between push-button ignition switch harness connector and ground.
      Push-button ignition switch Ground Continuity
      Connector Terminal
      M25 8 No

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair or replace harness.

  3. REPLACE BCM

    1. Replace BCM. Refer to REMOVAL AND INSTALLATION .
    2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

    Inspection End.

  4. CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT

    Check continuity between push-button ignition switch harness connector and ground.

    Push-button ignition switch Ground Continuity
    Connector Terminal
    M25 4 Yes

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace harness.

  5. CHECK PUSH-BUTTON IGNITION SWITCH

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace push-button ignition switch. Refer to REMOVAL AND INSTALLATION .

  6. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    Inspection End.