Where would the wiring be located for the keyless entry system
The keyless entry module, and the door lock and unlock relays, are located behind the cargo bay driver side trim panel. Remove the cover that hides the jack and look forward; you will see a relay box and a silver (probably) box with a sticker with a 5 digit code on it; that's the keyless entry module. There are separate relays for the "drivers door" unlock and "remaining doors" unlock (that's how they implement the "one push/two push" method on the remote and keypad. However, if
everything works right (all doors and hatch lock and unlock) from the rear hatch lock/unlock switch, then the relays are probably OK.
Do some searches - there are lots of threads on the broken wires in the door bundles and in the driver's rear seat wiring channel.
Check out this source for excellent wiring diagrams:
Auto - Online Repair Info
http://search.ebscohost.com/
ID: rrcc
PW: rebsco
Select: Auto Repair Reference Center
Fill in: Find Your Vehicle
Follow prompts down to Wiring Diagrams.