door wil not power unlock

[clancy10]

I just purchased a 2000 yukon denali and none of the doors will unlock with the switch on the front doors. I do not have a remote to test that feture. All 4 doors will lock with either switch. the cargo doors do nothing and I think that is a seperate issue. I am look for a wiring diagram for the truck and location that i need to look for a busted wire. booth switches have power coming in the switch on the orange wire and the lock (blue wire) has 12 volts when locking and the White wire (unlock) also has 12 volts moving the switch. I have put in a new relay nothing changed. I have a 6 pin relay and not a 5 pin ( parts store has trouble getting the correct relay ( the relay was correct for my truck from 99 and not the 2000?????? looking for some help from the electrical guru's