2022-2025 Audi A4/Q5 AC Buttons Not Working TSB

Audi has issued Technical Service Bulletin (TSB) 2078655/1 to address a concern regarding unresponsive or non-functional air conditioning control unit buttons in several models. This TSB applies to 2022-2025 Audi A4, A4 allroad, S4, Q5, SQ5, and Q5 e vehicles. The issue can lead to difficulties in operating the climate control system, impacting driver and passenger comfort.

This bulletin provides guidance for technicians on how to diagnose and resolve the problem, ensuring proper functionality of the climate control system. Owners experiencing issues with their Audi A4 Q5 AC buttons should be aware of this official communication from Audi.

Symptoms of Non-Functioning AC Buttons

Owners of affected 2022-2025 Audi A4, Q5, S4, SQ5, A4 allroad, and Q5 e vehicles may notice that one or more buttons on their AC control panel are not working. This can manifest as buttons that do not respond to input, making it impossible to adjust climate settings like temperature, fan speed, or air distribution. The customer complaint often describes the climate control display head for the A/C system as having no functionality.

Associated Fault Codes (DTCs)

When diagnosing this issue, technicians may find specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's HVAC electronics module (diagnostic address 0008). The primary fault code associated with this problem is:

This DTC indicates a mechanical malfunction within the air conditioning operating unit's buttons. The verbatim OEM fault label is "B131207: Button(s) in control panel, mechanical fault."

Diagnosis and Trigger Conditions

To diagnose the issue, a technician will first verify the customer's complaint by attempting to operate the Audi A4 Q5 AC buttons. If the buttons are indeed unresponsive, the next step involves checking the vehicle's event memory for the presence of DTC B131207 in the HVAC electronics module. The TSB notes that an internal voltage issue within the component can restrict the functionality and sensitivity of the AC operating unit buttons.

Repair Procedure Summary

The repair procedure outlined in TSB 2078655/1 involves a two-step approach:

1. Initial Attempt: If the AC buttons are not working as described, the technician should remove the entire air conditioning operating unit from the vehicle and unplug it. After a short period, the same unit should be refitted and reconnected. Following this, the vehicle's event memory must be rechecked for the presence of the "B131207: button(s) in control panel, mechanical fault" entry.
2. Unit Replacement: If the complaint persists and the fault code B131207 continues to appear after the initial removal and refitting process, it indicates that the air conditioning operating unit is defective. In this scenario, Audi recommends replacing the entire AC operating unit to resolve the issue with the Audi A4 Q5 AC buttons.

Important Considerations for Owners and Technicians

For warranty claims related to this TSB, Audi requires specific documentation. When billing for the repair, technicians must attach a video that clearly demonstrates the complaint. This video must include the vehicle's VIN and date, must not be edited, and should be in focus with sufficient light. It is crucial that the video does not show any people, faces, license plates, or customer data. If applicable, the problem's location should be marked for parts analysis.

Warranty Claim Information

For vehicles still under warranty, claims should be submitted in accordance with the Audi Warranty Policies and Procedures Manual. The TSB is informational only if the vehicle is outside of any warranty coverage. The following codes are relevant for warranty claims:

• Service Number: 8794
• Damage Code: 0010
• Labor Operations:
  • Remove and install/replace button(s): 8704 19xx / 8704 55xx
  • Check operation: 8704 0199 (5 TU)
  • GFF / Guided Functions: 0150 0060 (Labor according to diagnostic log)
• Claim Comment: As per TSB 2078655/1

All part and service references are subject to change, and technicians should consult the latest information via their Parts Department and ETKA, as well as the Repair Manual for fasteners, bolts, nuts, and screws that require replacement.

Source: NHTSA ID 11021477