2022-2026 Audi Door Lock Malfunction TSB 2063236/11

Owners of certain 2022-2026 Audi vehicles may encounter an Audi door lock malfunction, leading to difficulties opening doors or receiving warning messages. This technical service bulletin (TSB 2063236/11) provides comprehensive guidance for diagnosing and resolving these issues, which are often accompanied by specific diagnostic trouble codes.

Symptoms

Vehicle owners might observe one or more of the following symptoms related to a door lock malfunction:

• Front or rear doors (on either side) cannot be opened from the outside or the inside.
• Warning messages appear, such as those for the exit warning system or central locking, concerning the front or rear doors.
• The vehicle appears locked, but a door can still be opened without using the key.
• General failure of door locks to operate correctly.

Fault Codes / DTCs

When a door lock malfunction occurs, the vehicle's control unit may log specific diagnostic trouble codes (DTCs). These codes help technicians pinpoint the nature of the problem.

Code	Description	Module
B122D29	Lock unit for central locking Implausible signal	Rear drivers side door electronics, Passenger's door electronics, Driver's door electronics, Rear passenger side door electronics
B14FF29	Motor for child safety lock Implausible signal	Rear drivers side door electronics, Rear passenger side door electronics, Driver's door electronics
B122B13	Central locking motors Open circuit	Passenger's door electronics, Driver's door electronics

Technical Background

The door lock system in these Audi vehicles utilizes a microswitch to transmit an electrical signal to the door control unit when the interior or exterior handle is pulled. This signal activates an electric motor within the door lock, which then releases the rotary latch, allowing the door to open with minimal effort. For safety and redundancy, two Bowden cables provide a mechanical connection to the door lock. If the microswitch or control motor fails, the door can still be opened by pulling the interior handle twice or by using the exterior handle after activating the lock cylinder or interior handle.

Diagnosis and Repair Procedure Summary

Addressing an Audi door lock malfunction typically involves a systematic diagnostic approach. Technicians should first rule out incorrect operation by the customer, such as pulling the interior handle too quickly or inadvertently touching the convenience key sensor while locking or unlocking the vehicle. It's important to explain proper door operation to the customer, referencing the Owner's Manual if necessary.

Next, the vehicle's event memory entries should be read and cleared. If DTCs B122D29, B14FF29, or B122B13 reappear after cycling the ignition and operating the door, further diagnostics are required.

A critical step is performing a resistance measurement on the installed door lock between pins 2 and 4 using a multimeter. This measurement must be done while the lock is in temporary crash redundancy (TCR) mode, which is initiated by disconnecting the connector and firmly pulling the interior door handle twice. The expected acceptable resistance values are:

• Temporary crash redundancy (TCR) (without operating door handles): 1000 ohms
• IDH + TCR (operating interior door handle only): 382 ohms
• For vehicles with curved door handles (e.g., Q6 e-tron and Q5 type GU):
  • EDH + TCR (operating exterior door handle only): 212 ohms
  • IDH + EDH + TCR (operating interior and exterior door handles simultaneously): 158 ohms

There is a measurement tolerance of +/- 1% for all values. If the measured resistance falls outside this range, the affected door lock should be replaced. If the values are within specification, the technician should proceed to check the lock wiring according to the Guided Fault Finding system and the current flow diagram.

A mechanical check of components is also necessary. This involves inspecting the Bowden cables for any damage, incorrect routing, or stiffness. The exterior door handle should also be checked to ensure it returns to its flush original position after operation, as detailed in TSB 2060196. If any mechanical issues are found, the affected components should be replaced.

Production Solution

Audi has optimized the door lock manufacturing process. This indicates that newer vehicles produced after this optimization may be less likely to experience these specific door lock malfunctions.

Owner Action

If you are experiencing an Audi door lock malfunction or any of the symptoms described, it is recommended to schedule an appointment with an authorized Audi service center. They have access to the full Technical Service Bulletin 2063236/11 and the necessary diagnostic tools and procedures to accurately identify and resolve the issue. While this bulletin is informational for vehicles outside of warranty, repairs for in-warranty vehicles would typically be covered.

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Source: NHTSA ID: 11025252