2024 Audi Q8 / SQ8 Headlight Control Module Software Update

Audi has released Technical Service Bulletin 94CB (also known as 94CB UPDATE) to address a software-related issue affecting the Light Control Module (NVLW) in certain 2024 Audi Q8 and SQ8 vehicles. This update aims to prevent an "erroneous fault message" from appearing in the instrument cluster, which can be a concern for owners of affected vehicles. If you are experiencing a 2024 Audi Q8 headlight fault message, this TSB provides the solution.

This TSB, initially published on April 17, 2024, and revised on May 2, 2024, with updated work instructions, outlines a proactive software update to ensure proper headlight function and prevent unnecessary warning messages.

Symptoms

The primary symptom addressed by this TSB is the appearance of an "erroneous fault message" in the instrument cluster. This message is directly related to the vehicle's headlights, indicating a software issue within the control unit responsible for their operation.

Diagnosis / Trigger Conditions

The root cause of the "erroneous fault message" is identified as a software issue within the light control module, specifically the NVLW. This condition is not triggered by a specific event but rather is a pre-existing software anomaly that can manifest as a warning in the instrument cluster. The update is designed to prevent this message from occurring.

Important Warnings for Technicians and Owners

Audi has provided several critical warnings and instructions to ensure the successful and safe completion of this software update. Owners should be aware of these points, especially regarding what not to do or what to expect during the service:

• Do NOT replace the control unit: The TSB explicitly states, "Follow the on-screen prompts but DO NOT replace the control unit." The issue is software-based and does not require hardware replacement.
• SVM Code Entry: Technicians are warned, "DO NOT enter SVM code 94CBA216 during the replacement test plan for diagnostic address 00D6. Entering the SVM code during the replacement test plan can result in the information from the headlight modules not being read out properly and faults being stored in the headlight modules."
• Radiator Fan Safety: "Radiator Fan(s) may cycle ON high speed during the Update Process! There is a serious risk that personal injury may result if contact is made with spinning fan blades. Keep hands and all objects away from Radiator Fan(s) during Update Process!"
• Diagnostic Tester Connection: "The VAS Diagnostics Interface MUST ONLY be connected to the tester with a USB cable." Using Bluetooth or Wi-Fi for the update increases the risk of connection loss and potential damage to the control module.
• Battery Voltage: "Battery voltage must remain above 12.5 volts for the duration of the software update. Failure to do so may cause the update to fail, which could result in damage to the control module. Control modules damaged by insufficient voltage will not be covered."
• Tester Power Source: "Under no circumstances should the tester be used on battery power alone during the software update." This prevents the tester from powering off and potentially damaging the control module.
• Safety Recalls First: "All Safety Recalls must be completed prior to completing this campaign."

Repair Procedure Summary

The repair for the 2024 Audi Q8 headlight fault message involves updating the software for the Light Control Module (NVLW) using the Audi diagnostic system. The procedure is as follows:

1. Preparation: Connect a battery charger capable of a minimum 90 Amp continuous supply to maintain stable voltage. Switch off all vehicle consumers, such as air conditioning, heater blower, lights, and heated seats. Ensure the ODIS diagnostic software is up to date and the diagnostic head is connected to the tester via a USB cable. Place the selector lever in the 'P' (Park) position.
2. Headlight Activation: Switch ON the headlights and keep them on throughout the entire procedure.
3. Vehicle Scan: Perform a vehicle scan using the Guided Fault Finding (GFF) system.
4. Replacement Test Plan: Under the Guided Functions for diagnostic address 00D6, perform the replacement test plan. It is crucial NOT to enter SVM code 94CBA216 during this step and NOT to replace the control unit.
5. SVM Code Input: After the replacement test plan is completed, select "SVM – Code Input" and then enter SVM code 94CBA216.
6. Finalization: Follow any remaining on-screen prompts. Upon exiting GFF, ensure the diagnostic log is successfully sent to GFF Paperless.

This procedure ensures the Light Control Module (NVLW) receives the correct software version, resolving the potential for an "erroneous fault message" in the instrument cluster.

Required Tools or Parts

To perform this software update, specific tools are required by Audi service centers:

• Battery Tester/Charger: Must be capable of providing a minimum of 90 Amps continuous supply.
• Diagnostic Tester: A VAS6150X/VAS6160X or an equivalent diagnostic tool is necessary.

Owner Action

If you own a 2024 Audi Q8 or SQ8 and are concerned about an "erroneous fault message" related to your headlights, or simply wish to ensure your vehicle has the latest software, you should contact an authorized Audi dealer. The dealer will verify if your vehicle is eligible for this update using the 94CB code in the Elsa Campaign/Action Information screen. This update is typically covered under the New Vehicle Limited Warranty.

Source: NHTSA ID: 11002183