Download the SRT service manual.

Go to page 1812 (also 8W 66 4) and see what I see!

See the little box "Trunk Latch Assembly"? As motor "M" moves one war or the other, the switch puts a ground on BR/VT wire to indicate a locked condition OR a ground on BK/VT to indicate unlock.

So, if you take the trim out, I THINK you need to remove the assembly to get to the connector - but don't remember for sure. I remember the harness, I think it is exposed and you could cut the loom away and stick a sharp probe in there and see what voltage to ground you have. Anything over 2 or 3 volts indicates a "non-groundl" and a voltage of less than .5 volt indicates a ground.

OR.. we could go to connector C1 pin 21 and pin 22 of the TCM and measure the voltages there.
Now, all I have to do is find out where the TCM is located in the car!

Gonna roll over and get to sleep - I'll be back after work tomorrow, and after running to see my invalid sister.

EDIT: If you can get to the connectors on the lock OR the TCM, you should have a ground on ONE Of the two pins. That is, zero volts on ONE of the pins. If the unlock is grounded, there is the problem.

If the LOCK is grounded, we have some other problem.

If NEITHER is grounded (that is, there is more than 2 or 3 volts on both pins) then the lock assembly is not working right OR the ground wire to that switch is off, so it can't pass a ground to the module.

Voltmeter readings tell all. But if you just ground the "locked" line, I am afraid that IF there IS a ground on the UNLOCKED, you will confuse the module and it probably won't do anything but beep.

Gotta have voltmeter readings OR you disconnect both the unlock and lock wires going to the TCM and GROUND the lock one. THAT should make the thing work, but without volt readings, you wouln't know just what the problem is.

GOTTA find where the top module is.... I bet it's in the well next to the pump. But I hope not.

Gotta find that... gonna be hard to find that in the manual....