1988 GMC door locks

I have shaved the door handles from my ride and they work great. I have installed the outside safety button to get me in when I close the keys inside. What I don't know how to do is wire the door locks to open when I forget and lock myself out. Anyone have experience with this truck ? I can provide the diagram for the door lock circuit. Thanks ofWES

If I remember right, your truck has 5 wire reverse polarity locks which can be spliced in at the driver kick panel.  You'll have to use a two relay setup to connect a keyless entry/alarm system to them.  pull the driver kick panel off and there should be an access hole behind it at the bottom, just large enough to put your hand into.  You'll feel a wire harness about the thickness of a roll of quarters.  Usually there is enough slack in it to pull it down to the access hole and do your splicing there, if not you can also get to it where it comes out of the kick panel above the e-brake pedal, under the driver dash speaker.  you'll have to cut the cover off the loom to expose the wires.  you can catch power and the lock wires all in the loom.  Once you have found and exposed the loom just follow the diagram for 5 wire alternating locks and connect to the light blue wire and the BLACK/ white wire.  When you put your tester on them you should get 12volts at the blue wire when you push the driver door lock switch and then 12 volts on the BLACK/ white wire when you push the driver door unlock switch.

Thank you for the valuable info. I will test this out in the AM after I get another relay. I'll let you know how it goes. ofWES

I always unlock the door then take out the lock so it cant be locked again... why do you need locks if theres no handles? lol

I've only done locks on one of those trucks, but from what I remember from my friend's '90 pickup.... Getting the doorlock wires in the kick panel is difficult, but if you remove the left-front dash speaker, they're in a harness in there, with a lot more room to work.

bjordet I tried this using one relay to just unlock and had a positive result when the lock was already unlocked....but, when I locked the door and tried again, I blew the fuse. Here are a couple of questions: Do I have to use 2 relays? Will this circuit disable the current switch or work in conjunction with it? Am I cutting the black and white wire in half and inserting this circuit between the ends or leaving the wire whole and tapping on to it? Any info is greatly appreciated. Thanks ofWES

I appreciate the extra info. I sort of figured it out after I wrote you but am glad to have the confirmation. I was testing it incorrectly and trying to do it without cutting anything until I was sure what I was doing. I can always add the door lock feature but with no handles, it will probably not be needed. I was just trying to prevent an the accident of locking myself out because of the where the switch is on the door and how much it looks like the window switches. I know there will be a time I will lock myself out and I won't like it. Thanks ofWEs