95 Blazer door lock problem

i always check the easiest part first so if the passenger door doesn't unlock but all the other doors do this means the lock button is working. What happens when you use the key in the master actuator door does it do the same thing, if yes then pull off the passenger door trim, find the wires that control the actuator and then dissconect it, use the drive wires and connect them to a drill battery and see if you can get the door to lock and unlock if it does then your problem probably lies at the locking module which is located under the drivers dash. 

I have never seen this car before as i live in australia and used the vehicle information link to get the info on where the module is but this is how i go about finding problems no matter which car good luck hope this gives you a starting point 

it does not unlock regarless if you press the passenger or driver unlock button? most likely if the switches work the problem might be the actuator.