Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis Procedure
- 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.
- CHECK SELF DIAGNOSTIC RESULT
- Select "Self Diagnostic Result" mode of "BCM" using CONSULT.
- Erase DTC.
- Perform DTC CONFIRMATION PROCEDURE for DTC B219B. Refer to DTC Logic .
Is DTC detected?
YES
GO TO 3.
NO
INSPECTION END
- 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.
- REPLACE TCU
- Replace TCU. Refer to Removal and Installation .
- Perform registration of all Intelligent Keys using CONSULT.
INSPECTION END
- REPLACE BCM
- Replace BCM. Refer to Removal and Installation .
- Perform registration of all Intelligent Keys using CONSULT.
INSPECTION END
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.