2025 Audi A3, S3, RS 3 Remote Key and Infotainment Issues

Audi has released Technical Service Bulletin (TSB) 2074986/1, dated August 29, 2024, to address concerns regarding remote control key functionality and infotainment system issues in certain 2025 Audi A3, S3, and RS 3 models. This bulletin provides diagnostic information and a repair procedure for these problems, which are often linked to specific diagnostic trouble codes (DTCs).

Symptoms

Owners of the 2025 Audi S3, A3, and RS 3 may experience their remote control key not working. This can manifest as the key's remote functions being entirely inoperative. Alongside this, drivers might notice general issues with infotainment functions, affecting their usability or reaction time. It's important to note that while the remote function may fail, the keyless start and keyless opening functions (if equipped) typically remain available.

Fault Codes / DTCs

When diagnosing these symptoms, technicians may find specific Diagnostic Trouble Codes (DTCs) logged in the control unit for information electronics J794 (diagnostic address 005F). These codes indicate a problem with the vehicle's data bus system.

Code	Description
U10B800	Local data bus faulty
U10FA00	Local data bus single wire mode

Diagnosis / Trigger Conditions

The root cause identified for these issues, including the 2025 Audi S3 remote key not working, is a trapped wiring harness. Specifically, the wiring under charging unit 1 for mobile devices (component J1146) in the front center console can be routed improperly, leading to damage or interference with the data bus.

Repair Procedure Summary

The repair involves inspecting and correcting the routing of the wiring harness. Technicians will need to access the area under charging unit 1 for mobile devices (J1146) in the front center console. This requires removing the phone tray and the center console insert. Once exposed, the wiring harness is checked for any irregularities or signs of being trapped. If damage is found, the wiring harness must be repaired using a specialized wiring harness repair set. The process ensures the harness is properly routed to prevent future issues.

Required Tools or Parts

For the wiring harness repair, a specific tool set is required:

• VAS 1978 B/C: Wire harness repair set

Warranty Information

Audi TSB 2074986/1 outlines specific procedures for warranty claims. The service number for this repair is 9709, and the damage code is 0024. Labor operations include removing and installing the phone tray (operation 9108 1900), removing and installing the center console insert (operation 6817 1999, 20 TU), checking the wiring harness (operation 9709 0199, 10 TU), and repairing the wiring harness (operation 9709 41xx). Guided Functions (GFF) operation 0150 0060 is also part of the diagnostic protocol. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Important Warnings

Owners should be aware that if their vehicle is outside of its warranty period, this Technical Service Bulletin is provided for informational purposes only. In such cases, repair costs may not be covered by Audi.

Owner Action

If you are experiencing your remote control key not working or infotainment system issues in your 2025 Audi A3, S3, or RS 3, and especially if you suspect a trapped wiring harness, it is recommended to schedule an appointment with an authorized Audi service center. Be sure to mention the symptoms you are experiencing and, if known, any diagnostic trouble codes that may have appeared. The service center will perform the necessary diagnosis and repair as outlined in TSB 2074986/1.

NHTSA ID: 11007320