[Hi Im Mike]

Got a 2015 mazda 3 gts and when i lock my doors with the alarm all the doors lock but my hatchback trunk stays unlock.
Not sure how long this has been going on for but luckily no one's tried stealing my car yet D:

 

[lowincash]

Well, with all doors locked, the hatch will still open if you have the key on you whereas the doors will still be locked. Try opening the hatch without the keys on you and the hatch will not open if all other doors are locked.

 

[JerryO81]

Well, with all doors locked, the hatch will still open if you have the key on you whereas the doors will still be locked. Try opening the hatch without the keys on you and the hatch will not open if all other doors are locked.

I think most of us all thought similarly when we first got out cars. @lowincash is right though, it only opens if you have your key. If you lock your car from a distance, then set your key down and try to open the hatch, it doesn't open. It has a key sensor, just like the doors.

 

[Hi Im Mike]

Thanks so much lowincash. That was indeed the problem, now it's solved, yay!