Door lock cylinder broke - 1999 Jeep Grand Cherokee

Well your FOB REMOTE Battery could be dead, try replacing it
on you lock cylinder, sounds like the clip that holds it fell off, broke or rusted off ? You have to take your inside door panel off to check this, there are screws and clips that hold your door panel on, some screws are around your arm rest, inside door handle, and there might also be some around the panel itself, the clips are behind the panel, by using a flathead screwdriver you can pry these, by sliding the screwdriver around the panel, but be careful not to crack your panel.
once off, check your door lock cylinder, there should be a U shape clip holding it, if not check the bottom of your door.
if your lock is molded in the plastic door handle, then you have to take this off

the lock cylinder will have to be removed and disassembled; I recommend a locksmith because it is very touchy working on lock cylinders. if the lock has been giving you problems before and you have a spare key, you can recode a new cylinder to the original.

A lot depends on if the ignition switch will rotate or not. If it can rotate, the ignition lock cylinder can be removed fairly easilly and either the lock cylinder can be replaced, or you can take the existing lock cylinder to a locksmith for repair. If you replace the lock cylinder, then you will also probably get new keys for the new cylinder. These will not work your door locks however, so you will have to use two keys.

If the lock cylinder will not rotate, some extensive steering column disassembly will be required to get the lock cylinder out and several other parts may need to be replaced in the process.

get a wire make a hook and insert it in the door from the window rubber at the lock side when u feel its stuck to the lock lever pull it gentle try this severel times till u get the lock opened

if you want the original key to work yes

you have to get to the inside door panel. there should be a clip holding tha lock cylinder in place. check to see if it broke or came loose

disconnect the battery and pull the air bag fuse out to diable the air bag. Remove the steering coulmb trim covers and expose the lock cylinder. If the lock cylinder can be turned and is functional then push in the bottom tab and turn the lock cylinder then pull the whole cylinder out. If the keys broke inside and the lock cylinder is not functional the bottom tab will need to be drilled out.

according to my partsman (who has had great advice for many years), you do not have to remove the door panel to replace the door handle which contains the cylinder lock. the handle is released with a screw which you can see when you open the door. you will need a starhead screwdriver or socket. A new handle costs around $40 at a parts store in my area. call around for a locksmith who will re-key your key to the new lock or use the key which comes with the new lock, your choice. i am in dealing with this also

raise the window.

remove door pannel and water shield.

remove the plastic clips that secures the lock cylinder to the latch rod.

slide the lock cylinder clip out of engagement and remove lock cylinder from the door

disengage the plastic clip that secures the outside handle to latch rod.

remove bolts

then pull it out of door

you have made a boo boo somewhere,are you a certified city and guilds technician,if not then you shouldnt be repairing customers cars