Hey, Ford - you're committing a felony under the CFAA
. I use my car to go to the store and buy stuff, participating in Interstate Commerce. That make the car's computer a "protected computer" under the act. By accessing GPS info, you're "intentionally access[ing] a computer without authorization... and thereby obtain[ing]... information from any protected computer."
That subjects you to "a fine under this title or imprisonment for not more than 5 years, or both," since it's being done for commercial advantage.
And no, even if you got some sort of explicit ToS waiver from the original purchaser of the car, that doesn't extend to any used car buyer.