97 silhouette

This silhouette has many problems, but the ones I can't figure out are these. Power seats won't work, dome lights do not come on when door is opened, vanity mirror lights don't work and far rear cieling lights. the front dome lights come on from the switch on the dash only. when i press the front overhead dome button at the light it does not work. I did check all fuses. Also the passenger power window doesn't work. there is power at the motor and the motor does work. [tried it in the drivers door]. Dash lights do work and all turn signals work. Any Help would be Great.

Chargmon

Power seats: check the connections under the two front seats (some have other connections below the carpet as well)

Dome light: check if the overhead console interior light override is off.

Door switches that activate the courtesy lights are mounted in the door latches.

Make sure the override switch is off before attempting to turn on the rear roof courtesy lights.

It's possible the window regulator is faulty.

How many miles does this thing have?