The control unit with code 4H0941329 is an AFS (Adaptive Frontlight System) power supply module manufactured by Hella.

What is it for:

This control unit is responsible for the operation of the adaptive headlights (also called dynamic headlights or cornering headlights) on various Volkswagen Group vehicles (Audi, VW, Skoda). Specifically, it manages the following functions:

• Headlight rotation: Allows the headlights to rotate horizontally to the right or left based on the steering angle of the steering wheel, better illuminating the road when cornering.
• Horizontal self-leveling of headlights: Ensures that the headlight beam always remains at the correct height, regardless of vehicle load or changes in road slope.

Compatibility (according to information found):

This control unit is compatible with several models, including:

• Audi: A3 (8V) from 2013 to 2016, A6 (2011-2014), A8 (2010-2017), S3 (8V), S6 (4G), S8 (4H)
• Volkswagen: Touareg (2011-2018), Tiguan (2012-2018), Eos (2011-2016), Jetta (2011-2017)
• Skoda: Superb (2015 to 2019)

In summary, the 4H0941329 control unit is an essential component for the correct functioning of the adaptive front headlights, improving visibility and safety when driving at night or in low light conditions.

If you're having problems with your adaptive headlights and this is the code for the affected control unit, it may need to be replaced. It's recommended to have a qualified mechanic diagnose and replace it.