A common issue with Volkswagen Audi Group (VAG) vehicles equipped with sliding/tilting sunroofs is the loss of the “auto-run” feature. This means the sunroof or sunshade will only operate as long as the button is held. Releasing the button stops the movement. This problem can often be resolved by performing a basic setting or calibration using a VCDS (VAG-COM Diagnostic System). This article discusses a user’s experience with this issue and the persistent fault codes encountered even after attempting the procedure.
Understanding the Problem and Initial Attempts
The user reported that both the sunroof and sunshade lacked the auto-run functionality. The switches have two positions beyond the neutral position: a first position requiring normal pressure, and a second position engaged with additional force, intended for continuous movement. Initially, neither position triggered the auto-run feature. Following a suggested procedure (presumably a basic setting using VCDS), the first position functioned as intended, stopping upon button release. The second position also worked correctly, allowing the sunroof and sunshade to continue moving to their end positions after the button was released. However, two fault codes persisted.
Persistent Fault Codes: 0264 and 0274
Despite the successful restoration of the auto-run feature, the VCDS scan revealed the following fault codes:
- 0264 – Sunroof – Missing Calibration / Basic Setting: This code indicates that the sunroof system requires calibration or a basic setting adjustment.
- 0274 – Roof Shade – Missing Calibration / Basic Setting: Similar to the previous code, this indicates the need for calibration or a basic setting for the roof shade.
The provided VCDS log data shows both codes as confirmed and tested, indicating they are active and not just stored historical errors. The freeze frame data offers further insights: both sunroof and sunshade were at 0% position and not moving when the faults were logged. Interestingly, the sunroof was reported as “not normed,” while the roof shade was “normed.” This discrepancy could suggest a potential issue with the sunroof’s calibration process. Additionally, the “Adaption depth” for both components is at 100%, suggesting the system has attempted to adapt but hasn’t fully resolved the underlying issue.
Potential Solutions and Further Steps
While the initial procedure partially restored functionality, the persistent fault codes suggest the calibration might not be complete or correct. Possible next steps include:
- Repeat the Basic Setting Procedure: Ensure the procedure is performed precisely according to the manufacturer’s instructions, paying close attention to key cycles (if required) and specific steps for both the sunroof and sunshade.
- Check for Mechanical Obstructions: Verify that there are no physical obstructions hindering the movement of the sunroof or sunshade. Even minor obstructions can disrupt the calibration process and trigger fault codes.
- Consult Factory Repair Manuals: Refer to the official factory repair manuals for detailed troubleshooting and calibration procedures specific to the vehicle model and sunroof system.
- Seek Professional Assistance: If the issue persists, consult a qualified VAG specialist or dealership technician with experience in diagnosing and repairing sunroof systems. They may have access to specialized tools or knowledge required to resolve more complex calibration issues.
Conclusion
Restoring the auto-run feature of a sliding/tilting sunroof often involves performing a basic setting using VCDS. However, as demonstrated in this case, persistent fault codes like 0264 and 0274 can indicate underlying calibration problems. Thoroughly repeating the procedure, checking for mechanical issues, and consulting factory repair manuals are recommended steps for troubleshooting. If these efforts prove unsuccessful, seeking professional assistance from a VAG specialist is advisable.
