2021-2022 Audi Vehicle Locking System Diagnostic TSB

Symptoms of an Audi Vehicle Locking System Issue

Owners of 2021-2022 Audi vehicles may report that their vehicle has "locked itself" or experienced other unexpected locking or unlocking operations. This can lead to confusion and concern regarding the security and functionality of the vehicle's access system. The Audi vehicle locking system behavior is the primary symptom.

Technical Background

To understand why an Audi vehicle locking system might behave unexpectedly, technicians need to access the stored lock command history. This history is recorded in one of two main control modules:

• The comfort system central control module, identified as J393 (address word 0046).
• The central locking control module, identified as J429 (address word 0009).

Diagnosis Procedure

To identify the source of an unexpected locking or unlocking event in your Audi vehicle locking system, technicians must inspect the vehicle's locking history. The diagnostic process involves connecting to the vehicle's control modules and reading specific Measuring Value Blocks (MVBs) that contain event data.

Different Audi models and model years store this information in varying locations and formats:

• For A3 (8P), Q3 (8U), R8 (42), and TT (8J) models: The Central Locking Control Module Address 0009 stores up to 10 events in MVB: 101-110, with the source location in Field 1. For these models, measuring value blocks are only available from model year 2010.
• For A3 (8V) and TT (FV) models: The Central Locking Control Module Address 0009 stores up to 10 events in the MVB labeled "central locking history data".
• For A4 (8K), A5, Q5, A6/A7 (4G), A8 (4H), and R8 (4S) models: The Comfort System Control Module Address 0046 stores up to 5 events in MVB: 55-59, with the last event location in Field 1.
• For A6 (4F) and Q7 (4L) models: The Comfort System Control Module Address 0046 stores 1 event in MVB: 17, with the last event location in Field 1. Note that on these models, only the very last operating command of the vehicle locking can be read, and "Auto lock" overwrites this value.
• For A4 (F4), A5 (F5), Q5 (FY), Q7 (4M), A6 (4A), A7 (4KA), A8 (4N), and Q8 (4MN) models: The Comfort System Control Module Address 0046 stores up to 20 events in the MVB labeled "History data central locking *** last event".

It is important to be aware that control modules have a maximum number of events they can store. In some cases, historical data relevant to a concern may have been overwritten by more recent events.

Locking Event Lookup Tables

To interpret the data read from the Measuring Value Blocks, technicians refer to specific lookup tables provided in the TSB. These tables translate numerical IDs into descriptions of the locking or unlocking event.

Table A

This table is used for A3 (8P), Q3 (8U), R8 (42), TT (8J), A3 (8V), TT (FV), A4 (8K), A5, Q5, A6/A7 (4G), A8 (4H), and R8 (4S) models.

ID	Value
0	No Data Available
1	Lock Cylinder, L/F
2	Lock Cylinder, R/F
3	Lock Cylinder, Trunk
4	Remote Control Key
5	Remote Control Key, Trunk Button
6	Door Handle Sensor, L/F
7	Door Handle Sensor, R/F
8	Door Handle Sensor, L/R
9	Door Handle Sensor, R/R
10	Keyless Entry, Trunk
11	Interior Button, L/F
12	Interior Button, R/F
13	Interior Button, L/R
14	Interior Button R/R
15	Automatic Relock (Vehicle Was Not Opened Within One Minute Of Unlocking)
16	Terminal 15 (Accessory Power) On
17	Crash
18	Auto Lock (Vehicle Speed Over 9 MPH (15 km/h))
19	Auto Unlock (After Switching S-Contact Off (Vehicle Off))
20	Airbag Signal Failure

Table B

This table is specifically used for A6 (4F) and Q7 (4L) models.

ID	Value
0	No Data Available
1	Remote Control Key
2	Remote Control Key, Trunk Button
3	Keyless Lock
4	Lock Cylinder, L/F
5	Interior Button, L/F
6	Interior Button, R/F
7	Interior Button, L/R
8	Interior Button R/R
9	Auto Lock (Vehicle Speed Over 9 MPH (15 km/h))
10	Automatic Relock (Vehicle Was Not Opened Within One Minute Of Unlocking)
11	Lock Via Diagnostic Output Test

Table C

This table is used for A4 (F4), A5 (F5), Q5 (FY), Q7 (4M), A6 (4A), A7 (4KA), A8 (4N), and Q8 (4MN) models.

ID	Value
0	no data present
1	Lock cylinder L/F
2	Lock cylinder R/F
3	Remote control
4	Outside door handle sensor, L/F
5	Outside door handle sensor, R/F
6	Outside door handle sensor, L/R
7	Outside door handle sensor, R/R
8	Driver interior locking button
9	Front passenger interior locking button
10	Driver side rear interior locking button
11	Front passenger side rear interior locking button
12	Re-locking to opening via radio or outside door handle sensor
13	Autolock
14	Locking mechanism button in the rear lid
15	Locking via Smartphone-App
16	Locking by special purpose vehicle control module
17	Distance to vehicle
18	The terminal control, remote control
19	Terminal control, outside door handle sensor, L/F
20	Terminal control, outside door handle sensor, R/F
21	Terminal control, outside door handle sensor, L/R
22	Terminal control, outside door handle sensor, R/R
23	Terminal control, rear lid lock button / rear key sensor
24	Terminal control, locking cylinder, L/F
25	Terminal control, a front sensor for the keyless locking system
26	Piloted parking
27	Remote locking via connect-service
28	Remote locking via a vehicle positioning system
29	Antenna for short-range communication in the driver door
30	Antenna for short-range communication in the front passenger door
31	Antenna for close range communication in the rear lid
32	Pre Sense
35	Auto Lock Rear Lid

Important Warnings

• This TSB is informational only and not applicable to any Audi Warranty. Owners should be aware that diagnostic work related to the Audi vehicle locking system may not be covered under warranty.
• Be aware that the vehicle has a maximum number of events which it can store. In some cases, the historical data which corresponds to a concern may have been overwritten by more recent events. This means older locking events might no longer be accessible.
• On the A6 and Q7 models, only the very last operating command of the vehicle locking can be read. The "Auto lock" function will overwrite this value, potentially obscuring previous events.

Superseded Bulletin Information

This Technical Service Bulletin, 57 21 75 2022032/9, issued on April 1, 2021, supersedes Technical Service Bulletin Group 57 number 19-54, which was dated March 13, 2019. The revisions include updates to the header and model year applicability.

Additional Information for Technicians

All parts and service references provided in this TSB (2022032) are subject to change and/or removal. Technicians should always check with their Parts Department and/or ETKA for the latest information and parts bulletins. Additionally, the Repair Manual should be consulted for fasteners, bolts, nuts, and screws that require replacement during repair.

NHTSA ID: 10190280