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Home >> Infiniti >> 2017 >> Q50 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 428 (Security Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B219B: Security Code >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
  1. INTELLIGENT KEY REGISTRATION 

    Using CONSULT, register all Intelligent Keys again.

    Can engine be started with the registered Intelligent Key?

    YES

    INSPECTION END

    NO

    GO TO 2.

  2. CHECK SELF DIAGNOSTIC RESULT 
    1. Select "Self Diagnostic Result" mode of "BCM" using CONSULT.
    2. Erase DTC.
    3. Perform DTC CONFIRMATION PROCEDURE for DTC B219B. Refer to DTC Description .

    Is DTC detected?

    YES

    GO TO 3.

    NO

    INSPECTION END

  3. CHECK COMMUNICATION BETWEEN BCM AND INTELLIGENT KEY 

    Turn the ignition switch ON for checking communication between BCM and Intelligent Key.

    Can the ignition switch be turned ON?

    YES

    GO TO 4.

    NO

    GO TO 5.

  4. REPLACE TCU 
    1. Replace TCU. Refer to Removal and Installation .
    2. Perform registration of all Intelligent Keys using CONSULT.

    INSPECTION END

  5. REPLACE BCM 
    1. Replace BCM. Refer to Removal and Installation .
    2. Perform registration of all Intelligent Keys using CONSULT.

    INSPECTION END

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