You probably know this already but: Some things to look at before condemning the motor. First place is to look for melted plastic connectors. Sometimes the connector's spade terminals heat up and the plastic starts to melt allowing the spade to move away from it's correct spot. Many of these will look OK until removed and inspected carefully. Also could be a broken power feed wire in the door. Relays are used on some but not all options. Sometimes the relay will have melted plastic allowing the contact to move out of place. These can usually be opened for inspection. They are usually located under the seat. Of course, you have the switch itself. There are several different seat options as you already know. A schematic will be necessary if the visual check shows nothing. You can jump power right to the unplugged motor but depending on the transmission, it might not move anything.