2021-2022 Audi Door Lock Malfunction with DTCs B122D29, B14FF29

Symptoms of an Audi Door Lock Malfunction

Owners of affected 2021-2022 Audi models, including the Audi e-tron, may experience several issues related to the door locking system. These symptoms indicate a potential Audi door lock malfunction and should be investigated by a qualified technician.

Common customer complaints include:

• The front or rear doors cannot be opened from either the outside or the inside of the vehicle.
• Fault messages appearing in the Driver Information System (DIS). These messages may include "exit warning", "central locking", or "child safety lock".
• Doors that appear to be locked, but one or more doors can still be opened without using the key.
• The door closing assist feature is either completely inoperative or works intermittently.

Fault Codes / DTCs

When diagnosing an Audi door lock malfunction, technicians may find one or more Diagnostic Trouble Codes (DTCs) stored in the door control modules. These codes pinpoint the specific module and nature of the fault.

Code	Description	Module	Address Word
B122D29	Lock unit for central locking Implausible signal	Driver's door control module, J386	0042
B122B13	Central locking motors Open circuit	Driver's door control module, J386	0042
B122D29	Lock unit for central locking Implausible signal	Passenger's door control module, J387	0052
B122B13	Central locking motors Open circuit	Passenger's door control module, J387	0052
B122D29	Lock unit for central locking Implausible signal	Rear driver side door control module, J926	00BB
B14FF29	Child safety lock motor Implausible signal	Rear driver side door control module, J926	00BB
B122B13	Central locking motors Open circuit	Rear driver side door control module, J926	00BB
B122D29	Lock unit for central locking Implausible signal	Rear passenger side door control module, J927	00BC
B14FF29	Child safety lock motor Implausible signal	Rear passenger side door control module, J927	00BC
B122B13	Central locking motors Open circuit	Rear passenger side door control module, J927	00BC

Important Warnings for Owners and Technicians

Audi has issued specific guidance to prevent unnecessary repairs and ensure proper diagnosis of the door lock system.

• "Tip: For customer concerns described in this TSB, do not replace the door lock immediately!" This is crucial advice, as many issues can be resolved without replacing the entire door lock assembly.
• If the customer complaint can be reproduced after performing the diagnostic steps and if the affected vehicle was produced before calendar week 09/2022, only then should the door latch be replaced. This indicates a production solution was implemented in later vehicles.

Diagnosis and Trigger Conditions

Diagnosing the Audi door lock malfunction involves a systematic approach to determine if the issue is due to incorrect operation or a component fault. The electric door lock system relies on micro switches and electrical signals to the door control module, which then triggers an electric motor to release the latch. Mechanical Bowden cables also provide a backup.

Technicians are advised to:

1. Determine if the concern is caused by incorrect operation by discussing the door lock functions with the customer, referencing the Owner's Manual.
2. Ask the customer specific questions, such as:
   • Does the concern occur when the ignition is on or off (i.e., when the bus goes to sleep)?
   • Is the inner door handle pulled too quickly or pulled all the way to the stop?
   • Does the door open if the inner door handle is pulled twice? Can the outer handle then open the door?
   • How does the vehicle's door operation compare to a similar vehicle?
3. Consult the Owner's Manual, Repair Manual, Guided Fault Finding, and other relevant TSBs for additional information.
4. Interrogate the fault memory of the affected door control module(s).
5. Delete any stored DTCs, perform an ignition cycle, and open/close the affected door(s).
6. Re-check the fault memory. If DTCs do not return and the door operates as designed, the door latch is considered functional.

Repair Procedure Summary

If the DTCs return or the door latch does not operate correctly after initial checks, further inspection and potential repair are necessary. The repair process for an Audi door lock malfunction involves several steps:

1. Inspect Wiring and Cables: Carefully inspect the door wire harness and Bowden cables. Pay close attention to connections at the door lock and inner/outer door handles for any signs of twisting, loose connections, improper routing, damage, traces of water or ice, or stiffness.
2. Replace Defective Components: Replace any components found to be defective during the inspection.
3. Check Outer Door Handle Return: Verify that the outer door handles return flush to their zero/rest position. If they do not, refer to TSB 2060196, "57 Exterior door handles do not return to the zero position," for specific modifications.
4. Verify Door Operation: Ensure the doors open and close freely, and latch and unlatch smoothly.
5. Adjust Components: Adjust the striker plate, door alignment, and/or door hinges as needed.
6. Replace Door Latch (Conditional): If the customer complaint persists after all the above steps, and the vehicle was produced before calendar week 09/2022, then the door latch should be replaced.

Required Tools or Parts

For proper diagnosis and repair of the Audi door lock malfunction, technicians will need specific equipment:

Tool Number	Tool Description
VAS 6160/VAS 6150	VAS tester with the current version of ODIS (Windows 10)

Warranty Information

This Technical Service Bulletin (TSB 2063236/4) outlines warranty coverage for the Audi door lock malfunction:

• Claim Type: Standard warranty (110) covers up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, claim type G10 applies, requiring owner verification.
• Out-of-Warranty: If the vehicle is outside of any applicable warranty, this TSB serves as informational guidance only.
• Service Numbers: 5717 for front door lock issues, 5817 for rear door lock issues.
• Damage Code: 0040.
• Labor Operations: Specific labor operations are provided for checking door handles and Bowden cables, with corresponding Technical Units (TU) for time estimation.
• Diagnostic Time: Guided Fault Finding (GFF) is allocated 0150 0000, with a maximum of 30 TU.
• Road Test: No allowance (0 TU) for road tests before or after the service procedure.
• All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit.

Related Resources

Additional information and resources are available to assist technicians in understanding and resolving the Audi door lock malfunction:

• QR Code video: SoST_0008: Operating the door handle.
• Owner's Manual: Chapter “Opening and closing".
• SSP 970293: The 2019 A8 Electrical and Electronic Systems.
• SSP 990493: The 2019 A8 Introduction.
• SSP 990393: The 2019 A8 Driver Assistance Systems.
• TSB 2039206: "00 How to watch TSB videos."
• TSB 2060196: "57 Exterior door handles do not return to the zero position."

All part and service references in TSB 2063236/4 are subject to change. Technicians should always consult the Parts Department and/or ETKA for the latest information and bulletins.

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Source: NHTSA ID: 10238174