1999 GMC Truck door locks

Can you get into the vehicle?

Try a key relearn on it. May have to connect battery charger on it during process because it will drain battery. Turn key to on position for 10 minutes until security light goes out on dash, turn key to off position and take out for no more than 5 seconds then back on for 10 minutes, then of for 5 seconds then back to on for 10 minutes. Do not attempt to crank during this time, will reset process. After last 10 minute on time then attempt to crank.

You may have to remove door panels to get to open latch rods. Should not be this difficult of a situation unless key is wrong or door locking linkage is messed up. Best thing to do at this point is to remove door panels and look.

Remove door handle bezel as follows:
Insert a flat blade tool between the door inside bezel and the handle assembly.
Carefully bend outward the retaining clips while pulling out the bezel. If the vehicle is equipped with power locks, disconnect the wiring connector.
Remove window regulator handle if equipped, as follows:
Remove the clip behind door window crank handle with a small flathead screwdriver.
Pull the handle from the door.
Disconnect and remove the power accessory switch mounting panel and speaker wiring connector, as necessary. Using Trim Panel Remover (large flathead screwdriver) pry door panel and remove trim panel upper extension as follows:
Carefully pry the retainer from the door. Pull upward in order to release the extension from the trim panel.
Remove the retainer from the extension.
To install the retainer to the extension. Insert the extension onto the trim panel. Align the retainer into the hole in the door. Push the extension until the retainer seats.
Using a flat blade tool, carefully pry off the trim panel armrest screw cover in order to access the screw.
Remove the trim panel armrest screw. Using Trim Panel Remover carefully pry the retainer from the retainer seats.
Disconnect the courtesy light connector, if necessary.
Remove the trim panel from the door. Remove the courtesy lamp lens or the reflector.
Pull the retainers from the slot in the trim panel. Remove the retainers.

Sorry, just sent info of what I presumed it was. There should be 2 screws at bottom of door. Window switches should pop out of door with a screwdriver. Remove top extension on opposite side of mirror. Mirror switch should pop out as well. Should be two screws holding arm rest/handle in. Two screws behind plastic trim which is behind interior opening handle. After all screw removed it will either slide up or have to be pried off with long flat screwdriver to disengage clips from metal.

Peel back the plastic and check the link rods to the door latch and handle. See if they move.

Sometimes there are pieces of trim that you can pull off to access the screws. Part pulling is the best option for that. Dorman also makes a product line called Help. They make many door handles and latches. You can get them at parts stores such as O'Relliy's.

There are 2 nuts holding the handle in place that can be removed with door panel off. Tricky part is getting all the rods back connected. Door trim panel has several plastic retaining pegs. Sometimes putting them back the pegs get bent. I usually just the line each peg back up while putting panel back on. Just takes some time and patience.

Yes you can disconnect the rods when you removed the 3 bolts holding latch. Usually just the plastic clips break that hold rods to latch arms. Sometimes you can get those at auto parts stores. Dorman products make a line of replacement parts called Help! They usually make those small plastic clips and things that break easily. As for the door panel just keep trying. Nothing I can tell you without looking right at it. Its a pain but just keep trying different angles or move harnesses.