Control unit 8K0941329: What is it for and why should you replace it?

The control unit with code 8K0941329 is a fundamental electronic component for the safety and functionality of the headlights on various car models, mainly Audi (such as the A4 8K). Also known as the AFS (Adaptive Front-lighting System) power module , its main purpose is to manage the adaptive front lighting system, in particular the dynamic cornering light function.

Simply put, this control unit controls the movement of the headlights, orienting them left or right based on the steering wheel angle. This allows for more effective illumination of the inside of the curve, significantly improving nighttime visibility and, consequently, driving safety.

Reasons for Replacement

Replacing the 8K0941329 control unit is necessary when it stops working properly. The most common symptom of a fault is a failure of the adaptive headlight system, often indicated by a specific error message on the vehicle's instrument panel, such as "Adaptive headlight fault" or "Bending light (AFS) not working."

Other signs of a malfunction may include:

• The headlights no longer turn when cornering : The dynamic function is completely absent.

• Improper headlight positioning : The headlights may get stuck in one position, such as pointing downwards or to the side.

• Failure of one or both xenon headlights to light , although this is a less common symptom.

The causes of failure can be varied, from moisture infiltration inside the headlight, which damages the electronic components of the control unit, to simple exhaustion of its lifespan. Being a delicate electronic component, it is vulnerable to power surges and other vehicle electrical problems.