[Interesco]

Here's an example for a Tacoma https://www.tacoma4g.com/forum/threads/disabling-dcm-telemat...

Many cars have something similar (remove SIM card, cut antenna) that allows them to keep working without connectivity

[frickinLasers]

Would be nice to have a page full of forum posts like this for various cars.

Incidentally, this link recommends termination resistors, which I think are the better answer if there's a suitable connector (which I imagine is the case for most cars). If it's not terminated, I believe it can still pick up a nontrivial signal.