2021-2022 Audi Head-Up Display Malfunction TSB

Symptoms

Owners of 2021-2022 Audi vehicles may experience issues with their head-up display (HUD). The primary symptoms include the head-up display not turning on or functioning correctly. Additionally, the Multi Media Interface (MMI) display may periodically show the message "The selected system is currently unavailable". In some cases, this issue can also lead to a drained 12V vehicle battery.

Fault Codes / DTCs

When diagnosing the head-up display issue, technicians may find the following Diagnostic Trouble Code (DTC) stored in the Information Electronics control module -J794- (address word 005F) with a high-frequency count:

Diagnosis / Trigger Conditions

Audi's workshop findings indicate that the DTC U131C00 is stored when the head-up display control module -J898- fails to communicate over the fiber optic MOST data bus. Furthermore, the test program "0019 – Read data bus sleep inhibitor" can identify the head-up display as the component preventing the vehicle's data bus system from entering sleep mode, which contributes to the 12V battery drain. This confirms a software-related issue causing the head-up display to freeze and keep the data-bus system active.

Repair Procedure Summary

To resolve the head-up display malfunction and associated battery drain, a software update for the head-up display control module -J898- is required. The procedure involves several key steps:

1. DoIP Communication: Ensure that Diagnosis over Internet Protocol (DoIP) is active when flashing the control module via ODIS. This is typically set in Administration>>General>>GFF Process>>DoIP communication>>Only allow DoIP communication. A red LED on the VAS 6154(A) diagnostic tool indicates DoIP is active.
2. Head-Up Display Reset: The head-up display must be reset by temporarily removing its fuse for approximately 5 minutes. For Audi Q7, Q8, and e-tron models, this is fuse SF4. For Audi A6 and A7 models, it is fuse SG4.
3. Software Version Management (SVM): Follow the instructions outlined in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
4. Module Update: Update the head-up display control module -J898- (address word 0082) using SVM action code 82A004. The target software version is 6117 or higher. This update addresses the underlying software issue that causes the Audi e-tron head-up display and other models to malfunction.

Required Tools or Parts

Technicians will need the VAS 6154(A) diagnostic tool to perform the software update. Specific fuses (SF4 for Q7/Q8/e-tron, SG4 for A6/A7) are required for the head-up display reset step. The software update itself is performed digitally.

Owner Action

If you are experiencing a non-functional head-up display, the message "The selected system is currently unavailable", or unexplained 12V battery drain in your 2021-2022 Audi, it is recommended to contact your authorized Audi dealer. They can diagnose the issue and perform the necessary software update. This repair is covered under warranty for up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, it is covered under G10. If your vehicle is outside of these warranty conditions, this Technical Service Bulletin serves as informational guidance, and costs may apply. Addressing this issue promptly will restore the functionality of your Audi e-tron head-up display and prevent potential battery problems.

NHTSA ID: 10231072