

Yeah, it goes through the emergency call system, but just connecting the wires and leaving the dcm box alone is supposed to fix it. I have the forum post saved if you wanna look; https://www.toyotanation.com/threads/how-do-i-locate-the-dcm-telematics-unit-on-a-2020-corolla.1693507/#post-14400614
If you’re really worried about power use, you could switch to an itx motherboard with an soc laptop chip in it.