Automatic Headlight Leveling VW Touran 1T (Solution)

Vehicle: Touran from 2005 with xenon headlights.

The situation is this: Both headlights seem to only illuminate for about 5 meters, which means they are aimed too low.
Automatic regulation upon startup and when driving without function.

STG 55 with no error entries.

During the actuator diagnosis, both headlights are functioning correctly.

In measurement block 2, both sensors respond to pitch and roll movements.

Both values are between 75% and 80%.

According to the Labelfile (1T0-907-357.lbl), the value for the front sensor is outside of the tolerance range (assuming the information in that file is correct).

According to the RLF (Richtlinien für Lebensmitteleinrichtungen - Guidelines for Food Facilities), the values should be checked when a sensor is replaced.

Unfortunately, the exact procedure is not documented, so I'm a little unsure about how to proceed and in what order.
Could someone help me with something?

Ich würde die Koppelstange zwischen Sensor uns Achse einseitig lösen und Ein- und Ausfedern durch Bewegen am Sensor simulieren. Dabei die Messwertblöcke auf plausibel und gleichmäßig wandernden Wert beobachten (ggf 2. Pers(on).

The same applies to the second sensor.

Also, also check if the headlights move accordingly.

"I had a case where the tie rod was installed while the sensor was rotated approximately 180 degrees (the sensor arm can rotate 360 degrees). The further the vehicle rebounded, the more the control unit thought it was compressing. So, the logic on one axis was completely reversed. Overall, the control unit believed that the H-axis was compressing by 20-50mm. Consequently, the headlights were also tilted downwards significantly."

Greetings.
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.

What does MWB005 say when you invite people and/or sandbags IN?

The spring rates/suspension stiffness needs to increase on both axles.

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

Quote:

The values/spring rate must then increase on both axles.

Unfortunately, after several unsuccessful attempts to reset it, nothing works anymore. Before that --> forgotten (Alzheimer says hello) .

The only thing I can currently determine is that the front sensor reading is at approximately 80% (target range: 12.5 - 50%), which is outside of the acceptable limits.

I suppose I'll have to start at the beginning, whether I like it or not.
It might be more sensible to directly replace the front sensor with a new one using mechanical linkage from the start, rather than engaging in extensive and potentially fruitless troubleshooting beforehand. Visually, there's nothing apparent, and it reacts to suspension compression. However, the readings are incorrect.

Replacing the front sensor solved the problem.

The sensor is available as a new part from Volkswagen in two versions. The manufacturer is Hella (OEM).

Once with the support rod and once without. The price difference is €34.75 for a small connecting rod and two L-shaped metal brackets (à la Lopez).

However, I always recommend replacing the entire part because the rods tend to rust and break off at the ball joints.

You cannot purchase this part individually.