Disable external GPS

I use Android Auto a lot. My car's entertainment unit, which I connect my phone to via USB in order to use Android Auto, has it's own GPS antenna. But it's slow to obtain my location, and often downright wrong, like several kilometers/miles off. My phone's GPS is a lot faster and gets much better results. But it seems the external GPS in my car always takes over when I connect to it. Is there a way to disable it completely, and only rely on the phone's own GPS? Hardware information: Phone: OnePlus 7 Pro, Android 9, Oxygen OS 9.5.11.GM2BA Car entertainment unit: Alpine iLX-702D