texski

I pulled this code for the RH (passenger) headlight. Using the Foxwell NT530 to control the headlight module, I was able to move left, right, up, down, and even move both directions simultaneously ... like a laser show at a concert.

However, it still generates the Auto Driving Lights Control Defective, and the fault code is 805C0E, Stepper motor AFS, position sensor.
AFS - Adaptive Front Light System, I get it PDLS in Porsche.
I do not have the Auto Dip (?) message, which makes me believe this could be the horizontal motor.

Does anyone have a good diagnostic procedure for this?
And then I see the Headlight Control Module, which seems to be a ballast for the Xenon bulb. Can someone confirm these do not control these stepper motors.
Finally, for now, is there a focus operation for the Xenon lights? Seems like I ran across this somewhere, but can recall.

Thanks,
Mike
2012 CS

aa8023

Did you work it out? If so, how?

texski

I wanted to update this post. The short is that I purchased a new headlight unit. Based on my experience there is a SENSOR for the stepper motor. This is an integral part of the headlight unit and I could not find a replacement or a way to replace it.

There are 4 faults that can be associated with this error code.
1) Stepper Motor
2) Ballast/Bulb
3) Height Sensor
4) Stepper Motor Position SENSOR

Before replacing the headlight unit, I did replace the stepper motor with a new one from the dealership, and still received the same code. I used the active feedback/test function on my Foxwell scanner to test function of the headlight unit. It failed to work after my first post. So if someone wants to buy a Like New Headlight Stepper Motor, just used once for a test I promise ...

To answer a question in my original post, the ballast does not seem to control the movement of the Xenon lamp. Since I used the same ballast, this would not be the cause either. A defective ballast will cause problems with the bulb working correctly. Be careful about replacing ballasts. These are programmed by Porsche to as a theft deterrent. I understand that the control module associated with the ballast looks at mileage before it operates. If the mileage in the car is less than the last mileage counted in the ballast, it will not function. There's been alot reported on this so educate yourself before you buy a used ballast.

The Headlight Level Sensor / Height Sensor / Self-Leveling Sensor is a necessary part of the PDLS (this dynamic light system). It sends a signal to the headlight control module and the stepper motor adjust up and down according to ride height and speed. I seem to remember the lamp will adjust upwards at certain speeds. Going fast it aims higher to illuminate farther down the road. If this height sensor fails to send a signal, the car will generate a code.

The final failure in this circuit that could generate a fault would be the Stepper motor AFS, position sensor ... as the title of the code would suggest. I believe this is a sensor in the headlight unit that locates the ... position of the stepper motor (the fact that this is painfully obvious AFTER I report this is not lost on me). What was not obvious is that this sensor cannot be easily replaced, especially when I cannot locate it. I suspect the exterior lens would have to be removed and identifying this component is beyond my ability.

So, to summarize, Auto Driving Lights Control Defective, and the fault code 805C0E, Stepper motor AFS, position sensor, seems it identify a sensor in the headlight unit that cannot be replaced. I purchased a new unit from Gaudin for around $1,350 + shipping ($50), but no sales tax. Used units seem to be 1/2 of that. I can't see paying that much for an electronic part that is as old as the one that failed. We love this car. The first 10 years have been great and I expect we will appreciate the next 10 just as much.

If you have information that can improve or clarify this, let us know.

TomDK

Thank you @texski for your report !

I am in the same situation. My left light wents out from time to time and I have always a Error" "Automatic driving light".
I swapped lamps, control unit and the round stepper motor from side to side with no success.
If I swap the whole light the error changes the side. I figured also out that there are 2 motors in the headlight, the roundone which is switchable and a larger one which seems to be fixed.
Today I went to a garage and they found the 805C0E error amd a C12024 "Communication with Headlight Control Unit left".

In 2 weeks i have a meeting with a Porsche specialist but I thing he will tell me the same and I need a new headligt.
maybe I will switch to LED lights, a set is 1800 Euro. A original bi xenon headlight will also cost around 1500 Euro.

TomDK

The Porsche specialist told me the same as expected.
I ordered new lights but meanwhile I figured out that there is a own AFS modul for the dynamic corner light.

Can someone tell me were the modul (MODUL AFS LEISTUNGSMODUL 7PP941329T)
for the cornerlight and the servo for the cornerlight are located ??