You could try testing for power with VOHM and your remote release. In other words, get your keys handy, Tap into the wire you believe is the one according to the instructions and see if the current is present when the trunk mechanism releases.
Maybe you have the wrong wire or it's different on your car for some reason.
the other thought is to get an electrical schematic and see which wires are actually connected to the trunk release?
here you go: