Previously, I read several posts where people were trying to allow thier alarm remote to unroll and roll up the rear window. I just did it, its a lot easier than you think.
You need:
two constant aux neg - outputs. Output as long as you hold the button.
If you have these, a window module is not necessary, just 2 relays if your neg output can not handle the amps of the window motor.
The key is to tap into the harness at the rear switch in the door, This is wired so you do not have to have the key on to activate. There are three wires, one is WHITE/ black. The other two are up and down. All you need to do is apply these wires to ground to move the window without the key on.
to use the relays, attach them so when the neg - is applied (either up or down) by the output, the window wires go to ground.
This is all very well and fine, but BEWARE... an install like this is not a very safe install. with this type of setup, you absolutely must be within site of the vehicle to use it. If you are not, and your or someone elses child happens to be crawling through that window the window will not stop until you let go of the transmitter. Power window modules are designed and built with that in mind. If the current draw becomes too great, as if someone or something were wedged in the window) they will shut themselves off automatically. The chopice is all yours, but beware of the consequences. Just my own personal rant about that...now back to business
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If it don't fit, Force it.
If it breaks, You needed a new one anyway!
Good point, I am using mine as down only, within sight for a reason other than security.