A common issue with Volkswagen, Audi, Seat, and Skoda vehicles equipped with sliding/tilting sunroofs is the loss of the “one-touch” operation. This means the sunroof or sunshade won’t automatically open or close to its end position when the switch is briefly pressed. Instead, continuous pressure on the switch is required. This problem often points to a need for recalibration and can be addressed using a VCDS (VAG-COM Diagnostic System) tool. This article will delve into a real-world example of troubleshooting this issue and the remaining challenges even after initial success.
Understanding the Problem: Loss of One-Touch Functionality
A user reported that their sunroof and sunshade required constant pressure on the switch for operation. The switches have two positions beyond the neutral position, allowing for both incremental and continuous movement. However, even when engaging the second position (intended for automatic movement), the sunroof and sunshade would stop moving upon releasing the switch. This points towards a lost calibration or basic setting within the sunroof control module.
Applying the VCDS Procedure: Initial Success
Following a suggested VCDS procedure (not detailed in this article but readily available online), the user reported partial success. The sunroof and sunshade now operate automatically when the switch is pulled to the second position and released. However, the first position, intended for incremental movement, still requires continuous pressure. This indicates that while the automatic function has been partially restored, some calibration issues persist. The user also mentioned uncertainty about the “cycling the key” step in the procedure, as their vehicle has keyless ignition. They interpreted this as using the physical key in the driver’s door lock, attempting this with both open and closed sunroof/sunshade positions.
Persistent Fault Codes: Missing Calibration
Despite the partial restoration of functionality, the VCDS scan still reveals two persistent fault codes related to the sunroof system:
- 0264 – Sunroof (B1543 54 [009] – Missing Calibration / Basic Setting)
- 0274 – Roof Shade (B1544 54 [009] – Missing Calibration / Basic Setting)
These codes confirm that the sunroof and sunshade still require proper calibration. The freeze frame data associated with these codes provides further insight: both components are reported as not moving at the time of the fault, with a 0% position. Interestingly, the sunroof is indicated to be in the “tilt out” position, while the roof blind is noted as “normed.” This conflicting information suggests potential inconsistencies within the control module’s stored data.
Conclusion: Further Diagnosis Required
While the VCDS procedure partially restored the automatic operation of the sunroof and sunshade, the persistent fault codes and remaining operational quirks indicate the need for further diagnosis. The “missing calibration” message points towards the necessity of performing a complete and accurate basic setting procedure for both the sunroof and sunshade using VCDS. Consulting official repair manuals or seeking expert guidance is recommended to ensure the correct procedure is followed for the specific vehicle model and control module. Resolving these issues will likely restore full functionality and eliminate the fault codes, ensuring proper operation of the sliding/tilting sunroof system.
