My first how-to, so bear with me.. I also don't have pics, so I'll try to explain as clearly as possible. If you ever want to test to ensure your trunk pull-down motor works (the one I tested was on a '93 STS), here's how to do it.
Note - I tested mine with the unit out of car, and wire cut and exposed.
The unit is comprised basically of two components; the switch and the motor. You'll need the following tools to test the thing out:
1. Torx screwdriver (two sizes, not sure which ones, sorry)
2. Small open ended wrench (7/16 works fine)
3. Source of power - either a car battery, or better yet an AC to DC adapter (I used a 9V DC adapter)
4. Voltage meter - not necessary, but helps
Start by testing the motor.
First, remove the switch unit. There is a small torx screw that has to be removed to free it up. I noticed it was still held in place by the latch piece that holds the trunk, so I also had to really loosen up the two bolts that hold the metal plate to the plastic. Once there was enough play, the switch will come right off.
You'll notice at this point two small metal tab connections for current where the switch fed power to the motor. To test the motor, simply put your negative and positive from the battery or adapter to the two metal tabs. The motor should whir to live and the latch should either move up or down, depending on the polarity of your connection. If nothing happens, you know your motor has a problem. As a side note, you can further take the motor apart and clean the brushes and whatever, that may help.
Next thing to do is test the switch - I'll explain the way I did it with the voltage meter. First, know which wires are which:
Black wire: negative/ground
Black w/ stripe: constant power
Red wire: power signal from computer
To test the switch (while the switch is disconnected), first connect your ground/negative to the black wire. Then, connect your positive to both the black wire with the stripe and the red wire at the same time. Now, look on the switch and find the two small metal clips that supply the power to the motor. With everything hooked up and the switch open (not pressed), place the leads of your meter to those two small connections on the switch. Your meter should give a reading of 12V, or whatever your adapter puts out. If you press the switch at this point, it should kill the flow of power; this is because the switch is only pressed once the trunk is fully closed.
Finally.. time to test the unit as a whole. If it's apart, put the switch back onto the body/motor, it goes the reverse of removal. May be a little tricky, but you'll get it.
Hook up your power supply to the wires; your negative/ground to the black wire, and your positive to the black striped wire - this time though, leave the red wire coming off the switch alone.
With everything hooked up and your power live, take the red wire and touch it to the positive and black striped wire connection, making sure that the switch is also open; the motor should come to life. If you hit the switch, it should kill it as before.
If something isn't working right, double check any connections between the switch and the motor.. there really isn't much to it without the computer involved. If I'm leaving anything else, let me know. Hope this helps!