i have had my remote open my rear hatch for a few years now.. works beautifully. basically the first time you press the unlock button, both doors unlock. the second time you press it, the rear hatch opens.

coupled with this, when the car is turned off, the unlock button on both front doors will pop the rear hatch. when the car is on, the unlock button only works the front doors, and there is an aftermarket button to open the hatch, for safety reaons

not a terribly difficult mod, at the moment im not 100% sure how i did it, but i know i followed raque thomas' instructions pretty closely and it worked well.

downsides to this mod.. if you unlock your doors, you have to wait 30 seconds before re-locking them with the remote or the hatch will pop and the doors will no re-lock with the hatch open. if you ever plan to go to an aftermarket alarm, it will be very tough for an installer to figure out what wires do what because you will have stuff spidered all over.