Check for a broken wire in the harness going to the drivers door.
In my church, the head usher locks the doors after the service.
The only way i found to disarm the alarm was to use the back hatch lock. lock it and unlock it a few times with the key. if this doesnt work try the door locks
There should be two hinges and two bolts on each door easy to take out if you have the right tools. If your problem is with the electric locks and windows, there is a big wire connector beneath the steering column right next to the pedals you can't miss it. Just follow the bunch of wires from the door through and under the panel. It's difficult to get them back on, though, so make your decision carefully. Also, the doors sometimes do not line up correctly afterward.
you have a cut wire in the drivers side door wiring, they get opened & closed so much that wires get cut, open the black boot in the door jam & you'll find your cut wire.
on my '96 grand Cherokee the door switch was not depressed enough. you can replace it by opening the door removing 2 screws on the switch pull it out unplug it put another one in and put it back together. If you cannot find another switch pull the switch loose and place a small flat washer behind the switch on top and bottom and screw back together.
The door latch will need replaced.
you go to the parts store and buy new locks for your doors.
In the fuse box
yes if you are just buying those doors because they are cheaper you can put you electric locks and windows in the non electric doors
the lock solonoid (switch) may be bad. Both locks on my back doors sounded funny and would not lock. dealer replaced both switches now they slam into the 'locked' and 'unlocked' position.
The 1990 Jeep Grand Cherokee power locks wiring diagram can be obtained from most Jeep dealerships. The wiring diagram can also be found at most auto-parts stores.
Check Google.com
The 1997 Jeep Grand Cherokee power door lock fuse can be found in the fuse box. The fuse will be in the first column, third from the bottom.
something that locks doors
how do i fix my 1998 jeep grand Cherokee when the wheel turns right it locks up and I cant turn it back. If I put it in reverse it will unlock and I can drive again.
In my church, the head usher locks the doors after the service.
give more detail in the question what model grand prix... front doors or rear doors ever heard of child safety locks? - i can fix broken but not stupid