Electrical problem...possibly TCM, need wiring diagram of terminals

[aggiesc04]

I have a 2004 Nissan Sentra (1.8L). A month ago my gear shifter wouldn't shift out of Park, I'd have to manually release it with the shift release. I took it to a mechanic and they "fixed" it saying the wiring had simply become disconnected. The fix lasted about a week before I was back to using the shift release. When I opened the gear shifter up there was no lose wiring or disconnections. A week ago, I went out to my car to a dead battery. Assuming it was simply a dead battery, I replaced the battery, started it up to make sure it worked, then left the car to sit for approximately 3 hours, after which it was dead again. I pulled the battery, put a voltmeter on the battery leads and got back a reading of resistance in ohms. This would go to 0 when I slammed the drivers door hard enough. My suspicion was the keyless entry since it has so many wires that run to ground, however when I disconnected the portion of it in the drivers side door, it not only didn't fix the problem, but I could no longer get the ohms to read 0 after a good slamming. Looking back to the shifter problem, I checked the wiring between the battery and stop lamp switch. Appropriate voltage runs through there, but it doesn't from there to the A/T devide harness terminal. The wiring appears to go through the Transmission control module and I want to check there next. I have the BIG mechanics manual for this car and it provides the diagnostic procedure to check the power supply to the TCM, but it doesn't give enough detail on which terminals are which. There are two plugs going to the TCM. Does anyone have a wiring diagram/terminal details for this? Am I looking in the wrong direction? I'm not very good at car electrical systems so I'm kind of groping around in the dark. Any hints/help would be appreciated.