Rear doors will not open

You need to spray the door locks with WD40. The door panels are held on by push connectors. Take and gently pull on one side of the panel a little to see if they will pop out. Be careful not to bend the door panel made out of something like cardboard the can be helped with a screwdriver or a door panel removal tool. There should be two screws one by the inside door handle and one by the armrest. These are usually covered with a small plastic insert. After the door panels are off then spray the door locking mechanism good. Keep working the door try to open and close them. If one has been stuck for over a year and a half then it will be hard to get free. If you want to try before removing the door panel, is spray WD40 on the locking mechanism, with the window down spray WD40 into and on the door latches, let the WD40 penetrate for a day then spray them again. Let the WD40 penetrate some more. Then try opening the doors, sometimes it takes a while, once you are able to get the doors open the spray them good, while opening and closing the doors.

First you need to put back the correct size fuse, not good idea to keep upping the fuse you could burn up some wiring or cause much more damage then just your problem your having. Second you need to look at your door switches see if there broke or the wire is cut, if not then trace the wire back from door switch to fuse there should be a cut or burnt wire there some where. Use a meter and check for continuity.

If you are not familiar with how to take off the door panel YouTube videos often help. "how to remove door panel on a 1999 Chevrolet truck" or something similar.

The bad thing is the door is shut, this will make it difficult to remove the panel without maybe damaging it, getting to the fasteners may prove to be a challenge.

A small time body shop might do this rather quickly and inexpensively they will know what needs to be done, once inside.

However, should you want to try a last ditch effort before taking it somewhere try this.

Other than taking the door panel off inside and actuating the mechanism by hand then repairing whatever is wrong inside.

I have found this to work on stuck doors.

Try to the best of your ability, "unlock the door" (as if it would open). I mean make sure the lock mechanism is in the off position (inside) you might even do it with the key from the outside, just make sure it's unlocked, to the best of your knowledge.

Have someone hold the outside handle open even roll the window down and have them hold the handle inside (open) your second try.

Lay something like a small piece of plywood on the door panel even a towel folded up to sort of cushion the plywood, flat as you can get it, as close to the rear of the door as possible. This will spread out the "load", maybe prevent damage to the door panel (like busted plastic).

Lay down in the seat and give the plywood a good swift mule kick.

Hopefully it will pop open.

I have done this on different cars for friends and family, even in the auto salvage yard when a door needed to be opened

Should it come open during your kicks inspect the situation maybe a chunk of wood or a toy got slammed in there, thus wedging it tight. Could be that you need to spray some lubricant in the mechanism in the jamb just do this prior to closing it back.

I also looked in YouTube for your exact situation you may find something similar for other cars, if you alter search wording.

Let us know how it goes.

(never had that problem with mine)

The medic

It sounds a lot like somebody has changed the locks in the doors. If the same key starts car and opens trunk but will not open doors I would say the door locks have been changed. You will have to have another key made for them by a locksmith. If it takes one key for ignition and another for the trunk then the same key should do the doors that does the ignition, in this case it is possible that the ignition has been changed out, leaving you in the same place. Having a key made for the door locks. If you are using a key-less fob then you really need to see a Chevrolet dealer to find out what is going on. Either way it is a real bummer! Good luck!