Alfa Giulietta cannot calibrate Xenon Headlights

[Ruggero1912]

Good morning everyone.
I have an Alfa Giulietta 2.0 with original Xenon Headlights pack.

I noticed that the beam lights are facing too downwards.

For this reason I tried to calibrate the Xenon unit from MES, but it returns me an error, even though I placed the Giulietta in the required conditions (flat surface, no one in the car, low beams turned on).

In the following image I reported a screenshot showing the values read from MES.

I have the doubt that the pitch is not correct, but I am not sure about that, what is considered a correct value when the car is on flat ground?

Do you know what component could cause wrong measurements of this value?

IMG-20240828-WA0006.jpg (315.53 KiB) Viewed 8634 times

Thanks for your attention

[shpuncik]

check sensors physically if they are OK. voltages don't look correct.

[Ruggero1912]

check sensors physically if they are OK. voltages don't look correct.

Thanks, I will check it

[Ruggero1912]

Hi, many months have passed, but still I did not managed to calibrate the sensors.

I bought a new front side sensor online, waited for it and installed it, but now from MES I read a voltage value of about 5 volts for the front sensor.

I am not sure if it is an hardware or a software fault...

Do someone has the right impedance values for the sensors? So that I can compare with the ones that I can measure from mines.

Hope that this is not off-topic, but I really did not managed to find this information and in general infos related to this procedure.

[shpuncik]

Hi, many months have passed, but still I did not managed to calibrate the sensors.

I bought a new front side sensor online, waited for it and installed it, but now from MES I read a voltage value of about 5 volts for the front sensor.

I am not sure if it is an hardware or a software fault...

Do someone has the right impedance values for the sensors? So that I can compare with the ones that I can measure from mines.

Hope that this is not off-topic, but I really did not managed to find this information and in general infos related to this procedure.

voltages for rear/front should be similar.
5V looks like either dead sensor or not plugged properly. in your first post front sensor voltage of ~0.5V is way to low - either bad sensor or adjusting arms are bent/broken.

[Ruggero1912]

Thank you very much for your reply.

However I was wondering if someone knows the pin out of the headlight pitch sensor and the expected impedance values on the pins, so that I can verify the ones from my unit.

However I did not manage to find any schema online, do someone knows where I could find it?

Thanks again