Obviously, check your fuses if you haven't already. It sounds like you probably did even though you didn't say so. According to the glovebox owners manual, you can only pop the trunk with the Remote Trunk Release button with the car in Park. You can get wiring diagrams from a repair manual such as a Chilton or Haynes Repair Manual. These manuals usually only have the powertrain wiring diagrams though and not the accessories. Your best bet would be to go to
www.alldatadiy.com and get a subscription for your car. A one week subscription costs $5.99 per car and a one year subsciption costs $24.95 for the first vehicle and $14.95 for any additional vehicle. Anything you want to know about
your car (VIN specific) can be found there.