Primastar Headlight Range Control Fault

I had something similar happen with my Primastar. If the low beam shines too far down or up, the servomotor in the headlight might be the culprit. This little electric motor adjusts the headlight beam. Before replacing anything, though, I'd inspect the electrical connectors leading to the headlights and the control module. Sometimes a loose connection or corrosion can cause these kinds of problems. Have you checked those?

Interesting. Where exactly is the control module located? Also, is there a way to test the servomotor itself before I start tearing things apart?

The control module's location can vary, but it is often near the fuse box or under the dashboard. As for testing the servomotor, it requires specialized equipment. You'd need to use a multimeter to check the voltage and resistance, or a diagnostic scan tool to read the live data. I'd advise against dismantling it yourself unless you are a professional, because the servomotor is very sensitive. I ended up just taking mine to a workshop.

Thanks, that's really helpful. I appreciate the advice about the servomotor and where to find the control module. I've decided to take it to my mechanic. Turns out it was a defective servomotor, just as suspected! Cost me 1040€ to get it fixed. Thanks again for your help!