It looks like the gear tunnel's proximity unlock might be doing its own thing, not necessarily syncing up with the general vehicle lock status. Having your phone key in your pocket might be playing a role here.
If your ride has its own app, take a peek at any settings that shout out gear tunnel...
I've been using the Graco SnugRide car seat in my R1T, and it's been a winner. The adjustable base is super handy, making it a breeze to find the right angle for my little one. Plus, it's lightweight, making it hassle-free to move in and out of the R1T. The fabric is also easy to clean – perfect...