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Technical Service Bulletin Transaction No.: 2079919/2
57 Vehicle cannot be opened from outside at one of the doors Release date: Dec 18, 2025
Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
Ad, S5 (FU) 2025 | 000000 — 085761
Not applicable
AG (FN) 2026 | 000000 — 013162

REVISION HISTORY

Revision | Date Purpose

2 - Revised Condition (Added revision history)

Revised Warranty (Updated labor operations)

1 11/10/2025 | Initial publication

Customer states:

One of the doors cannot be opened intermittently from the outside. It can always be opened from the inside. All
other doors can be opened from the outside.

Once the interior door handle of the door in question has been pulled out, it can be opened again from the outside.

Workshop findings:
The customer statement can be reproduced.

In some cases, the DTC "B122D29 - Lock unit for central locking - implausible signal - passive/intermittent” is
logged in the diagnostic address of the door control unit for the faulty door.

Technical Background

Software and/or hardware issue in the door control unit or in the door lock.

Production Solution
Not applicable.

Service
With DTC “B122D29 - Lock unit for central locking - implausible signal”.

If this DTC is not logged, please continue as described below under "Without event memory entry...”

Please measure the resistance on the installed door lock between pin 2 and pin 4 (see image below) using a
multimeter. To do this, the lock must be in temporary crash redundancy mode. This is initiated by removing the
connector from the lock and firmly pulling the interior door handle twice.

Image 1 shows the illustration of the connector for the right door lock (see Figure 1).
Image 2 shows the illustration of the connector for the left door lock (see Figure 1).

Figure 1. Illustration of the connector for the right door lock (1), and for the left door lock (2).
The expected acceptable values are:
Temporary crash redundancy (TCR) (without operating door handles): 1000 ohms

A measured value of 1000 ohms means that the lock is in TCR mode (lock can only be opened mechanically). If the
value is not 1000 ohms, please pull the interior door handle twice again as far as the stop and repeat the
measurement.

Switch for interior door handle = IDH
IDH + TCR (operating interior door handle only): 382 ohms
Measurement tolerance +/- 1% in each case.

Then close the door, open it again and repeat the measurement. Instead of TCR 1,000 ohms, OL (open load) is now
measured.

If the results deviate from the specified values, please replace the affected door lock.

If the results correspond to the expected values, please check the lock wiring according to Guided Fault Finding. If
this is OK, please replace the door control unit for the faulty door.

Without DTC “B122D29 - Lock unit for central locking - implausible signal”.
The complaint can be reproduced.

Please check whether the complaint also occurs when the vehicle is unlocked.

If so, replace the door control unit on the faulty door.

If not, postpone the repair (refer to “The complaint cannot be reproduced”).

In this case, replacing parts or attempting repairs will not fix the problem. Unjustified work/replacement parts will be
charged back. Invoicing under warranty is not permitted.

The complaint cannot be reproduced.

Please check whether TSB 2079690, 00 Combined software update 03.10.00/C (28.13.01) KD2 is visible for this
vehicle. If this is the case, please perform the software update described in TSB 2079690.

Warranty

Claim Type:

* — Ifthe vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.

Service Number:

6438 — Problem reproduced Without DTC “B122D29 - Lock unit for
central locking - implausible signal”.

OR

5717 — Front Lock measure / replace

5817- Rear Lock measure / replace

Damage Code: 0040
Labor Operations: Remove and install front door trim 7059 1900 See SRT with
associated
Operations
Remove and install rear door trim 7073 1900 See SRT with
associated
operations

With DTC B122D29 AND part is 08S or higher AND issue reproduced with door
locked/unlocked

Check door locks 5717 0299 10 TU

Check door locks 5817 0299 10 TU

Without DTC B122D29 AND part is 08S or higher AND issue not reproduced

Check door locks 5717 0299 10 TU

Check door locks 5817 0299 10 TU

For software update according to TSB 2079690.

Software update, including 0151 0010 See SRT with
connecting battery charger associated

operations
Fixed rate for software update, 0151 0040 130 TU

including all required preliminary and
follow-up work (including bus sleep
cycle, calibration drives, and
additional work)

In the case of additional attempts, 0150 9999 50 TU

an additional lump sum of 50 time p h

units is possible per flash doc ac ted

cancellation. ocumente
attempt

With DTC B122D29 AND measure NOK AND part is 07S or lower

Measure door locks 5717 0499 20 TU

Measure door locks 5817 0499 20 TU

Remove and install door lock 5717 1950 See SRT with
associated
operations

Remove and install door lock 5817 1950 See SRT with
associated
operations

With DTC B122D29 AND measure QK AND part is 07S or lower
OR

without DTC B122D29 AND part is 08S or higher AND issue only reproduced with
door unlocked

Measure door locks 5717 0499 20 TU

Measure door locks 5817 0499 20 TU

Remove and install door control unit | 6438 1950 See SRT with
associated
operations

After any of the above repair actions are taken

GFF / Guided Functions 0150 0060 Time stated on
the diagnostic
protocol

Claim Comment: As per TSB 2079919/1

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

When performing the combined software update, time stamps are not required for billing under warranty. You are
therefore permitted to work on other vehicles at the same time. The combined software update can also be
performed by non-productive personnel.

Additional Information

All part and service references provided in this TSB (2079919) are subject to change and/or removal. Always check
with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

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