VW Touran Headlight Control Module Fix Guide

I experienced a similar issue with my 2008 VW Golf. With some experience working on VW electrical systems, I can share my repair journey. The symptoms matched yours exactly, inconsistent beam height and warning lights. The auto-leveling system was malfunctioning due to a defective servomotor in the headlight assembly. Initially thought it was just the control module, but diagnostic testing revealed the deeper issue. The repair involved: Full diagnostic scan of the lighting system, Testing the headlight switch and wiring, Replacing the faulty servomotor, Recalibrating the range control system Total repair cost was 1040€, including parts and labor. The workshop needed about 4 hours to complete everything. Before suggesting specific solutions for your Touran, could you provide: Current mileage, Are both headlights affected or just one side, Any recent repairs or modifications to the electrical system, Did the problem develop gradually or suddenly This would help determine if your issue matches what I encountered with my Golf. The control module integration with the auto-leveling system can vary between models, even within the VW family.

Last service was in November 2022. The auto-leveling system might be the real culprit here, rather than a faulty control module. Both headlights show inconsistent beam adjustment, with the left one being more problematic. The light intensity varies significantly, especially during cold starts. After checking the error codes with my OBD reader, it points to a possible servomotor issue, not a complete headlight unit failure. The adaptive headlights sometimes work correctly for short periods before misbehaving again. I noticed moisture in the left headlight housing which could be affecting the electrical connections. I will try to dry it out before considering more expensive repairs. Has anyone successfully fixed this without replacing the entire headlight assembly?

Thanks for the additional details about the moisture issue, this definitely aligns with what I experienced in my Golf. The moisture in the left headlight housing is likely the root cause affecting the servomotor and electrical connectors. When I initially spotted moisture in my headlight, I also tried drying it out. However, this proved to be just a temporary fix. The water had already caused corrosion in the adaptive headlights system, particularly around the servomotor connections. What worked for me: Removed the headlight assembly, Cleaned all electrical connectors with contact cleaner, Replaced the damaged servomotor, Added new gaskets to prevent future moisture intrusion, Tested the control module functionality The good news is you likely wont need a complete headlight replacement. The light intensity issues and inconsistent beam adjustment can typically be resolved by addressing the moisture damage and servomotor. My repair ended up costing 580€ for parts and labor, significantly less than a full headlight assembly. I recommend getting the headlight properly dried and sealed before replacing any electrical components. Otherwise, new parts will face the same moisture-related issues. Would you like guidance on checking the headlight seals or testing the servomotor connections?

The symptoms you describe align perfectly with my situation, and your repair experience is very helpful. The moisture issue does seem to be the primary concern, especially given the problems with the left headlight. Since my beam adjustment is more erratic during cold starts, this reinforces the moisture theory. I would appreciate guidance on checking the headlight seals, as this seems like a logical first step. The auto-leveling system might recover once moisture is eliminated, and I want to explore this before spending 580€ on servomotor replacement. The varying light intensity during operation suggests electrical connection problems rather than complete component failure. For now, I will: 1. Remove the headlight assembly to inspect for water ingress points 2. Clean and dry all electrical connections 3. Test the headlight switch and range control functionality 4. Monitor the beam adjustment behavior after drying If these steps dont resolve the issue, I will likely need to follow your repair path with the servomotor replacement. Thanks for sharing the detailed fix, it gives me a clear direction to pursue.