2022-2024 Audi MIB3 Volume Control Not Working U11B900

Bulletin History

This Technical Service Bulletin, identified as 91 24 08 2072873/3, was published on May 7, 2024. It supersedes a previous bulletin, Group 91 number 24-75, dated February 23, 2024. The bulletin has undergone several revisions:

• Revision 3 (May 7, 2024): Revised header (added customer codes), updated service (reset time), and updated warranty (labor operations).
• Revision 2 (February 23, 2024): Revised header (updated part number filter) and updated warranty (labor operations).
• Revision 1 (January 30, 2024): Initial publication.

Symptoms

Owners of affected 2022-2024 Audi vehicles may experience specific issues related to the MIB3 infotainment system's volume control. The primary symptom reported by customers is that "The touch-operated volume control in the center console is not working." Additionally, owners may find that "The volume control, as well as the skip buttons are inoperable." These symptoms directly point to a malfunction with the Audi MIB3 volume control U11B900 system.

Fault Codes / DTCs

When diagnosing the issue of the Audi MIB3 volume control U11B900, technicians may find a specific Diagnostic Trouble Code (DTC) stored. This DTC is typically found in the Information Electronics control unit, identified as J794 (address word 005F).

Code	Description
U11B900	Volume control no communication (active/static)

Diagnosis / Trigger Conditions

The presence of the DTC U11B900 indicates that the Information Electronics control unit (J794) is not communicating with the volume control. This fault code directly points to the inoperable Audi MIB3 volume control U11B900. The issue is often reported by customers when they notice the physical volume knob and skip buttons are unresponsive.

Repair Procedure Summary

Technical Service Bulletin 91 24 08 2072873/3 outlines a two-step repair process for the Audi MIB3 volume control U11B900 issue. The initial step involves performing a terminal 30 reset for the volume regulator E67. This is done by removing the relevant fuse for at least 30 seconds and then reinstalling it. After the reset, the technician checks if the volume control is functioning correctly.

If the volume control is still not working after the terminal 30 reset, the next step is to replace the volume regulator E67. This procedure ensures that the multimedia system operating unit regains proper functionality. Technicians are advised to refer to the current wiring diagram in ELSA for the relevant fuse location.

Required Tools or Parts

For this repair, specific parts may be required depending on the outcome of the diagnostic steps. Technicians should always check with their Parts Department and/or ETKA for the latest information and parts bulletins.

• Fasteners, Bolts, Nuts, and Screws: As needed per the repair manual (refer to ETKA).
• Driver Volume Control (E67): Quantity 01, if replacement is necessary (refer to ETKA).

Warranty Information

This repair is generally covered under Audi's new vehicle limited warranty, specifically for vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring verification of ownership. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin is for informational purposes only, and repair costs may apply.

• Service Number: 9110
• Damage Code: 0010
• Claim Comment: As per TSB 2072873/3

Labor Operations:

Operation	Code	Time Units (TU)
Check multimedia system operating unit (KL30 reset)	9195 0199	20 TU (without parts replacement)
		5 TU (with parts replacement)
Remove and install multimedia system operating unit	9195 19XX	See SRT with associated operations
Charge battery	2706 8950	See SRT with associated operations

Diagnostic Time: The diagnostic time is recorded as GFF (Guided Fault Finding) with code 0150 0060. The time stated on the diagnostic protocol should be used, with a maximum of 75 TU.

Important Warnings

Technicians are advised to consult the current wiring diagram in ELSA for precise fuse identification. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

NHTSA ID: 10255307