2022-2025 Audi MIB3 Volume Control Not Working TSB U11B900

Audi has issued Technical Service Bulletin (TSB) 2072873/6 to address a common problem affecting the MIB3 infotainment system's volume control in various 2022-2025 Audi models. This bulletin specifically targets instances where the Audi MIB3 volume control U11B900 fault is present, leading to inoperable volume and skip functions. The underlying cause has been identified as a software issue.

This TSB provides detailed instructions for Audi technicians to diagnose and resolve the problem, ensuring that owners can regain full functionality of their infotainment system's audio controls. The fix involves a software update to the affected control unit.

Revision History

Technical Service Bulletin 2072873/6 has undergone several revisions to refine the repair process and update information:

Revision	Date	Purpose
6	-	Revised Warranty (updated labor ops)
		Revised Service (updated instructions)
5	12/17/2024	Revised header (added MY25)
4	05/07/2024	Revised header (added customer codes)
		Revised Service (updated reset time)
		Revised Warranty (updated labor ops)

Symptoms

Owners of affected Audi vehicles may experience the following issues with their MIB3 infotainment system:

• "The touch-operated volume control in the center console is not working."
• "The volume control, as well as the skip buttons are inoperable."

These symptoms indicate a communication problem within the system, preventing proper operation of the audio controls.

Fault Codes / DTCs

When diagnosing this issue, technicians will typically find a specific Diagnostic Trouble Code (DTC) stored in the vehicle's Information Electronics control unit, identified as J794 (address word 005F). The relevant DTC is:

Code	Description	Module
U11B900	Volume control no communication	Information Electronics name -J794-

This DTC, U11B900, confirms that the volume control module is not properly communicating with the rest of the MIB3 system.

Diagnosis and Trigger Conditions

The complaint can be easily reproduced by attempting to use the volume control or skip buttons, which will be unresponsive. The presence of the U11B900 fault code in the Information Electronics control unit (J794) further confirms the diagnosis. This indicates a software-related communication breakdown rather than a physical hardware failure, specifically addressing the Audi MIB3 volume control U11B900 issue.

Important Warnings

It is crucial for technicians to follow the repair procedure precisely to avoid further malfunctions. The TSB states:

"It is imperative that you use the correct update medium based on the part number of the volume control unit installed in the vehicle. Failure to do so will result in malfunctions."

This warning highlights the importance of matching the software update to the specific hardware configuration of the vehicle's volume control unit to prevent additional problems.

Repair Procedure Summary

The resolution for the Audi MIB3 volume control U11B900 issue involves a software update to the Information Electronics control unit (J794). The general steps for this repair include:

1. Check Current Software Part Number: Technicians must first identify the current software part number of the volume control unit installed in the vehicle.
2. Access Diagnostic System: Using the ODIS (Offboard Diagnostic Information System) diagnostic tool, access diagnostic address 005F.
3. Display System Identification: Within ODIS, display the system identification in the top window of the diagnostic interface.
4. Note Software Version: Search for the Sensoric LSR System information and accurately note down the current software version.
5. Create Update Medium: Utilize the Audi Flash Memory Card (FMC) system to create the necessary update medium. This process requires a USB stick that complies with at least the USB 2.0 specification. The update medium cannot be ordered via the parts system.
6. Access Engineering Menu: To initiate the update, access the red engineering menu. This is done by pressing the top right of the MMI display J685 for at least 3 seconds with two fingers.
7. Start Software Update: Follow the on-screen navigation within the engineering menu to start the software update process.
8. Leave Engineering Menu: After the update is complete, exit the engineering menu using the on-screen navigation options.
9. MMI Restart: The MMI system will automatically restart following the update.
10. Feedback Documentation: Finally, perform feedback documentation, including a version comparison, using SVM code 693A001 to confirm the successful completion and verification of the software update.

Required Tools or Parts

To perform this software update, specific tools and part numbers are referenced:

• Diagnostic System: ODIS (Offboard Diagnostic Information System)
• Update Medium Creation Tool: FMC (Flash Memory Card) system
• USB Stick: Must comply with USB 2.0 specification.
• Software Part Numbers (SW part number of volume knob) and Associated FMC Part Numbers/SVM Codes:

SW part number of volume knob	FMC Part Number	SVM Code
8Y0.919.616	8W0.906.961.CR	693A001
8Y0.919.616.A	8W0.906.961.CS	693A001
8Y0.919.616.B	(Not specified)	(Not specified)

Warranty Details

Audi's warranty policy for this Technical Service Bulletin (TSB 2072873/6) outlines the following:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 9110
• Damage Code: 0040
• Labor Operations:
  • Program operating unit: 9195 2599 (20 Time Units)
  • Remove and install volume control (only if needed): 9195 19XX (See SRT with associated operations)
  • GFF (Guided Fault Finding): 0151 0060 (Time stated on the diagnostic protocol)
• Claim Comment: As per TSB 2072873/6

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit.

Owner Action

If you are experiencing issues with your Audi's MIB3 volume control or skip buttons, and suspect the Audi MIB3 volume control U11B900 fault, it is recommended to schedule an appointment with an authorized Audi dealer. They have the necessary diagnostic tools and software to perform the required update. The TSB 2072873/6 indicates that if your vehicle is outside of warranty, this bulletin is for informational purposes only, suggesting that the repair might not be covered free of charge in such cases. Always confirm warranty coverage with your dealer.

Source: NHTSA ID 11028402