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You open the back hatch door and pull the panel away from the latch and push down on the lever to the lock the lock will then pop open and you can shut the hatch
If code isn't written in the owners manual then remove the drivers door panel and get the code on label of the door handle.
If its like my 2003 Expy, the relay for the rear wiper motor also controls the rear hatch lock
Hatch Lock Airlock
I had the same problem with my 99 limited and the lock actuator need to be replaced
By taking your key and sticking it into the lock near the hatch an turning.
May be a BCM glitch or the rear trunk latch there is a recall from gm about the rear hatch latch
I have the same problem with mine. What i found out is its the cable form the outside handle goes to a plastic piece that pivots and opens the door. On this piece the rivet holding it in gets rusted, and as you pull on the outside handle it stays in the opened position.Once you start driving the doors automatically lock and because the rear hatch is still you cannot unlock the back door to close it.The Fix - There is a small plastic square piece on the cover of the back door on the inside where the lock is. Take this out and use a flashlight to see the white plastic piece with the cable attached to at the back of the lock assembly.Get a screwdriver and push this down, then unlock the door and the door with close. It is pretty easy.I took the whole back panel off and used wd40 all over the lock and moved it manually until it freed itself and i haven't had a problem in about a month.Mark
My 2002 Tribute has the same problem, caused by central locking motor failure in the back hatch.
To replace lock cylinder in the hatch ,first inside hatch panel must be removed. After removing the panel you will have access to the lock cylinder. Remove the linkage to the cylinder and pull the retaining clip from the cylinder and the lock can be removed from the outside of the latch. This is not a hard job to do , 1 hour max if your slow .
no it has to be done by power lock
I found on my 2006 the lock assembly in the rear needed lubrication in the button that opens the rear hatch window. I sprayed wd-40 lube into the button assembly and worked it. After liberally lubing it, the lock worked fine. It gets wet and seizes over time. You need to remove the inner panel to get to it.