Driver's Priority Unlock, 2001 Chevy Venture

I have a 2001 Chevy Venture and i am trying to hook up to my factory drivers priority unlock feature, So I am at the BCM and i am testing for the lock and unlock, no problem.  Then i try to find the drivers unlock onlt, and the only wire I can find is a wire that shows 12v and then drops to 0v when i push the factory transmitter.  So i probe the wire with my test light and I get nothing.  So I decisde to press the unlock button while I hold the test light to this wire, and the drivers door does not unlock like ti is supposed to, so I pull the test probe of the wire and then the drivers door unlocks, so it remembered that I had pressed the unlock button.  I can't figure out what I need to do.  Is this the wrong wire or do I need to do something else to this wire?  I was thinking I will try to cut the wire and see if breaking the continuity then reconnecting it works, is that a terrible idea?

Thanks

|       POWER LOCK|RED / black *3        |-  |BCM, to right of glove box  |

you have to 5 wi the unlock motor wire, so you need  relay.

So just like half of this but with a 5 amp fuse between the car and the relay.   In my case the switch is the BCM and the motor is the other half?

Just a quick thought, do I need the fuse in the set up, or just to test?

Thanks a lot.