2021-2022 Audi Door Lock Malfunction TSB

Owners of 2021-2022 Audi vehicles, including the Audi e-tron, may experience an Audi e-tron door lock fault where doors fail to open or display warning messages. This technical service bulletin, TSB 2063236/1, provides comprehensive diagnostic and repair information for technicians to resolve these door lock malfunctions.

Symptoms

If you own a 2021-2022 Audi and are experiencing an Audi e-tron door lock fault, you might notice the following symptoms:

• Front and/or rear doors cannot be opened from either the outside or the inside.
• Fault messages appearing in the Driver Information System (DIS), such as those related to "for exit warning, central locking, child safety lock".
• Doors appear to be locked, but one of them can be opened without a key.

Fault Codes / DTCs

Technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the respective door control modules:

Code	Description	Module
B122D29	Lock unit for central locking Implausible signal	J386, J387, J926, J927
B122B13	Central locking motors Open circuit	J386, J387, J926, J927
B14FF29	Child safety lock motor Implausible signal	J926 Rear Driver Side, J927 Rear Passenger Side

• J386 refers to the driver's door control module (address word 0042).
• J387 refers to the passenger's door control module (address word 0052).
• J926 refers to the rear driver side door control module (address word 00BB).
• J927 refers to the rear passenger side door control module (address word 00BC).

Important Warnings

• Do not replace the door lock immediately! This TSB emphasizes that technicians should follow the diagnostic tree to determine the root cause before replacing any parts.
• Parts replacement, without following this TSB, does not resolve this issue. Claims for replaced parts will be subject to review by Audi.

Diagnosis and Repair Procedure Summary

Addressing an Audi e-tron door lock fault requires a systematic diagnostic approach outlined in the TSB. The process involves identifying whether the issue is an operating error, an electrical fault, or a mechanical problem.

Operating Error Checks

First, technicians will determine if the concern is due to incorrect operation. This involves:

• Reviewing the Owner's Manual chapter on "Opening and closing" with the customer.
• Asking questions such as whether the concern occurs with the ignition on or off, if the inner door handle is pulled too quickly or all the way to the stop, and if pulling the inner door handle twice allows the door to open.

Electrical Error Checks

If an operating error is ruled out, the focus shifts to electrical diagnostics:

1. Software Updates:
   • For A6, A7, A8, and Q8 models, technicians should follow TSB 2055932, which addresses central locking/parking brake warning, alarm, or exterior mirror issues, and DTCs B122D29, B14FF29, or U122800. This ensures door control modules are at the latest software level.
   • For Audi e-tron quattro and Audi e-tron Sportback models, TSB 2055933, concerning exit warning messages and central locking/alarm issues with DTCs B122D29, U122800, and/or B14FF29, should be followed to update door control module software.
2. Fault Memory Interrogation: Interrogate the fault memory of any affected door control module. Delete any stored DTCs, perform an ignition cycle, and open/close the door. Re-check the fault memory.
3. Measuring Value Blocks: If DTCs persist, technicians will observe specific measuring value blocks (Da0042, Da0052, Da00BB, Da00BC) for Door Status, Central Locking Button, Rotary Latch Status, and Status Door Lock to check for plausible conditions during door operation.
4. Resistance Measurement: If measuring value blocks are implausible, resistance measurements are taken directly at the door lock using a VAS tester. Specific resistance values are provided for various switch states (emergency unlock, inner/outer door handle switches). If measurements are within specifications, the door lock itself is not the root cause.
5. Wiring and Connections: Visually and electrically check the PINs at the door lock, the door control module, and the connecting wiring. Also, inspect wiring and connections at the A-pillar and B-pillar coupling points.

Mechanical Error Checks

If electrical checks do not resolve the Audi e-tron door lock fault, mechanical components are inspected:

1. Bowden Cables: Inspect the Bowden cables, especially their connections at the door lock and inner/outer door handles, for issues like twisting, loose connections, improper routing, damage, or stiffness.
2. Component Replacement: Replace any defective mechanical components.
3. Outer Door Handles: Check if the outer door handles return flush to their zero/rest position. If not, TSB 2060196, which addresses exterior door handles not returning to the zero position, should be followed.
4. Door Operation: Verify that the doors open and close freely and latch/unlatch smoothly.
5. Adjustments: Adjust the striker plate, door alignment, and/or door hinges as necessary.

Required Tools

Technicians will need specific tools to perform the diagnostics and repairs:

• VAS 6160/VAS 6150: VAS tester with the current version of ODIS (Windows 10)
• VAG1594D: Auxiliary Measuring Set
• VAS 1978/35-22: Tool for primary locking
• VAS 1978/35-2: Tool for secondary locking

Warranty Information

This TSB outlines warranty claim types and procedures:

• Claim Type: 110 (for vehicles up to 48 months/50,000 miles) or G10 (for CPO Covered Vehicles, requiring owner verification).
• If the vehicle is outside warranty, this TSB serves as informational guidance only.
• Service Numbers: 5717 (Door lock front), 5719 (Cable front), 5817 (Door lock rear), 5819 (Cable rear), 9732 (Door wiring harness).
• Damage Codes: 0010 or 0040.
• Labor Operations: Specific labor operations are provided for door lock removal/reinstallation, cable removal/reinstallation, and door wiring harness removal/reinstallation.
• Diagnostic Time: GFF (0150 0000) for diagnostic protocol, with no allowance for road tests before or after service.
• Claim Comment: As per TSB #2063236/1.

Additional Information

This TSB references several other documents for further details:

• 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 2055932: 57 Central locking/parking brake warning, alarm or exterior mirror issues, DTCs B122D29, B14FF29 or U122800 stored
• TSB 2055933: 57 Exit warning message with various central locking & alarm issues, DTCs B122D29, U122800, and/or B14FF29 stored
• TSB 2060196: 57 Exterior door handles do not return to the zero position
• TSB 2011732: 00 Software Version Management (SVM), operating instructions

All part and service references are subject to change, and technicians should consult the latest information from their Parts Department or ETKA.

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Source: NHTSA ID: 10199640