'89 200Q stuck rear power windows.

[LL - NY]

Trying to diagnose WHY my rear windows won't work on an '89 200Q. I AM
getting power to the rear window switches. Safety switch seems to be
working properly, the rear window switches light turns on and off in
conjunction with the safety switch. Depressing a switch in either
direction does cause the dome lights to dim. (One thing of note is the
rear ciggy lighter doesn't work, and from the wiring diagram, they
seem to be linked in a series.) I checked voltage at the switch and it
appears that all is in order.

Has anyone ever had a window that just got physically stuck and it
simply needed a boost (while the electricals were working "properly"?
I haven't tried directly jumpering the motor wires (just to verify,
which two are they?) to a 12V source, it was getting late. Any
suggestions?

LL - NY