Won't start, is it pats system?

[Jay11]

1999 Ranger 4.0 4x4 85k miles.
Truck is rarely driven. I crank it once a month, drive it one block and back. Battery is dead and had to jump it back in November with wifey's C240 with a new battery. Last week I went to jump it again and it won't start even though it's turning. Then I noticed the keyfobs weren't un/locking the doors. Maybe this is the issue. Where should I start at least so I can make sure the pats system is working properly and recognizing the keyfobs?

 

[fastpakr]

Does the anti theft light flash when you try to start?

 

[lil_Blue_Ford]

The key fobs to unlock/lock doors are a separate system than the actual ignition key/PATS.

I’d start with checking fuses and seeing what the anti-theft light is doing.