Check the fuse for the mirrors first.
If it's good go after the power and ground. Make sure all connections to the switch are good, tight and corrosion free.
Getting at the switch may require removing the door panel.
See "Related Questions" below for more
did you try the fuse?
no no
Easy, get rid of it
If you are getting a Lean code then it is probably being caused by the intake plennum gaskets. This is a common problem on the Windstar. The fix is relatively easy.
2001 ford winstar sport burning engine oil
I had the same problem seems that the tumblers for the lock were seised up took it in to get it fix an was out in 15 mins.
where is the #5 injector? how long does it take to fix
about $1100.00
To fix the power door locks on a 2002 Ford Windstar, start by checking the fuse related to the power locks in the fuse box; replace it if it's blown. If the fuse is fine, inspect the wiring and connectors in the door for any signs of damage or corrosion. You may also need to test the door lock actuators with a multimeter to determine if they're functioning properly. If necessary, replace any faulty components, such as the actuators or switches.
Pull the fuse. In 1996 Windstar, it's fuse #33
Trouble code P0301 means: Cylinder 1 Misfire Detected
Unplug it now! Our 2002 Windstar LX almost burst into flames this morning because the malfunctioning Driver's seat drive motors shorted out! Take Windstar to Ford and have the undercarriage framework replaced before yours also overheats and starts a fire.