has there been any work done recently on your rig? stereo install?
Going off memory, each door has a signal tap going to it, wires running under the inner door sill/plate. If your marker lights or door seals are ****, that area fills up w/ water.
There really isn't much to these steps, You have a switch and a motor. Glancing through that troubleshooting doc they lay it out pretty good for you.
If you didn't install them yourself, there is a specific h2 install guide there also. Read over that first, then go over troubleshooting.
http://www.amp-research.com/products...-applications/
Use an electrical meter, test light wont verify proper voltage.
If your not sure on anything, let me know.