Many Volkswagen Alltrack owners are interested in enabling the automatic rain closing feature for their windows and sunroof. This feature, often referred to as “rain close,” automatically closes these openings when rain is detected. Successfully enabling this feature often requires VCDS (Vag-Com Diagnostic System) coding and understanding the specific Rain Light Sensor (RLS) installed in your vehicle. This article delves into the complexities of VCDS coding for the Alltrack, focusing on the critical role of the RLS.
Understanding the Rain Light Sensor (RLS)
Different RLS part numbers dictate whether rain closing is possible. Generally, sensors labeled RLFS allow for rain closing, while those labeled RLHS do not. However, discrepancies can arise between the sensor’s label and its actual functionality. For instance, a VCDS autoscan might identify a sensor with a part number known to support rain close but labeled as RLHS, creating confusion.
One documented example involves a Golf Mk7 where various RLS part numbers were tested:
- 5Q0 955 559: Compatible (Rain Close Works)
- 8U0 955 559: Compatible (Rain Close Does Not Work)
- 5Q0 955 547: Compatible (Rain Close Works)
- 7N0 955 559: Compatible (Rain Close Does Not Work)
This highlights the importance of not solely relying on part numbers. Furthermore, an Alltrack auto scan revealed an RLS with part number 5Q0 955 559 and labeled as RLS, which theoretically should support rain closing.
VCDS Auto Scan Analysis for Alltrack
A 2018 Alltrack VCDS auto scan provides valuable insights: Within the “Address 09: Cent. Elect.” section, the following information pertaining to the rain sensor is found:
Rain Light Recognition Sensor: Subsystem 2 - Part No SW: 5Q0 955 559 B HW: 5Q0 955 559 B Labels: 5Q0-955-547.CLB Component: RLS 047 0105 Serial number: S4Y17M09D13H12M27S26 Coding: 00A8DDThis confirms the presence of the 5Q0 955 559 RLS in this particular Alltrack. The “Coding: 00A8DD” value might be the key to enabling or disabling the rain closing function through VCDS. Further investigation into specific coding adaptations for this module is required to activate the feature.
While part numbers and labels offer clues, real-world testing is crucial. Confirming the functionality of the rain closing feature requires practical verification. Additionally, different Volkswagen models and years might require different coding procedures.
Conclusion
Enabling rain closing on a Volkswagen Alltrack involves navigating the intricacies of RLS compatibility and VCDS coding. While identifying the correct RLS part number and label is essential, real-world testing is paramount. Consulting resources like the Ross-Tech forums and thoroughly researching specific coding adaptations for your Alltrack’s module are crucial for success. Remember, accurately interpreting VCDS auto-scan data and applying the appropriate coding changes are essential steps in activating this convenient feature.
