You mentioned unplugging the door switch did not result in the dome light and beeper going off so it is not the cause.
Get a DVOM and unplug the Left Front Door Module, (power window switch assembly of driver door panel).
Unplug the door switch.
Look for a Dark Blue wire and test it for continuity with body. If continuity is present, the wire is shorted between the door switch and the control unit. Usually such shorting would occur around the door pillar where the wireharness comes out of the body and goes into the door panel. Du to constant opening and closing of the door, the wires can be exposed resulting in shorting.
Thursday, October 7th, 2010 AT 7:27 AM