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do this in exactly the steps I explain. Trust me, I'm a 20 year chevy dealership technician. lock all doors manually. go to passenger door and unlock and then lock the door using the key. this resets the alarm module. without opening any doors, go to the drivers door and unlock w/ the key. open door and then start the vehicle. This should take care of you problem. Have a nice day
lt30 van passenger door ,i was under the impression that it would open from the inside regardless of the door lock ,it fact it has to open from the inside by the handle for the certificate of homoglonation that this vehicle is issued with to be sold in europe.Now the fact that this door cannot be opened from a locked position is in fact a vehicle test requirement and i would fail it on the test(MOT) for this sole reason ,so i would assume that as the lock is faulty and you cannot open the door this is why you require the door open to change the lock ,try the wire to each of the three wires in turn push a pin through the wire and then touch it with a hot wire ,hit the wrong wire and it will only flash a spark at the worst ,if you still cannot open the door then its down to removing the door panel and using a big screwdriver to open the door ,
look for the lock and unlock relays check them to see if they work.what you do is look at relay.look at terminal blades.you have a number 86 and 85 terminals on relay.connect terminal 86 with a jumper wire to positive battery terminal.then connect 85 terminal to ground with jumper wire.if the relay click its good. if not replace it.if relays is good you have bcm problems it control door locks.dealership job.