626 '90 rear hatch lock unit
 

Hi there.
I've recently bought a rear hatch LOCK-UNLOCK button for my car. Since the rest is allready pre-mounted in the car, it should really just be plug&play, but whenever I attach the button(unless I hold down UNLOCK) the room-fuse dies.
What can I do? I can't find any electrical diagram regarding this button, so I'm not sure what should be connected to the 4 wires.

If anyone's able to help, please do.. This problem is really naggin' me.

Cheers...