Is it a pulsed negative output? Chances are pretty good it is so all you need to do is connect the negative pulsed output from the AutoLoc to pin 86, +12VDC to pins 85 and 30 and the positive wire from the solenoid on the door popper to pin 87. You will not have anything connected to 87a so if you only find a 4 pin relay, it won't have this and are sometimes a few cents cheaper. Make sure you go with a relay large enough to handle the load the solenoid will require. Best thing to do is connect it all outside the vehicle if you can so you can diagnose what isn't workign correctly before putting it behind door panels and running wires through the boot in the door.

Hope this helps and if you have any other questions, fell free to give me a call.