[DeTomaso] Driver's side window motor

[Garth Rodericks]

Another electrical issue that developed on the way home from the Niello Concours last week...
My driver's side window motor no longer operates.  I've never before had a problem with the window motors. Driving home Sunday evening I had the window down a couple inches for some airflow in the cabin (since the heater/AC blower fan was not working).  I closed the window for a few minutes then when I tried to re-open it the motor made a momentary noise like it was starting to lower the window, then stopped.  After that, nothing!  No noise or movement either up or down.
I tried replacing the switch with a new Bosche switch, and no change.I removed the door panel and verified it's not the dreaded window gear issue - the motor is not turning at all.I've lowered the window manually with the emergency crank and still no movement, regardless of the window's position.I checked voltage on the different posts with my multimeter and found that one of the contacts was only getting about 3-4 volts when the switch was put in the down position, and the other contact got 11-12 volts when the switch was put in the up position, but no movement in either direction regardless. The passenger side window works fine and the motor has the same 11-12 volts at either post depending on the switch position - up/down.All fuses are good.
Any thoughts on where to look for the problem?  Or suggestions on how to further diagnose?I cannot see any break in the wiring or a poor connection somewhere.Again, could this be a relay issue?  The stock wiring harness appears untouched in this area behind the switch console and under the dash.
I have not yet tried running a jumper wire directly to the motor from the switch.  I suppose that should be my next step.
Again, open to any ideas. Can't really drive the car anywhere if I can't close the windows and lock it up.
Cheers!Garth



-------------- next part --------------
   Another electrical issue that developed on the way home from the Niello
   Concours last week...
   My driver's side window motor no longer operates.  I've never before
   had a problem with the window motors. Driving home Sunday evening I had
   the window down a couple inches for some airflow in the cabin (since
   the heater/AC blower fan was not working).  I closed the window for a
   few minutes then when I tried to re-open it the motor made a momentary
   noise like it was starting to lower the window, then stopped.  After
   that, nothing!  No noise or movement either up or down.
   I tried replacing the switch with a new Bosche switch, and no change.
   I removed the door panel and verified it's not the dreaded window gear
   issue - the motor is not turning at all.
   I've lowered the window manually with the emergency crank and still no
   movement, regardless of the window's position.
   I checked voltage on the different posts with my multimeter and found
   that one of the contacts was only getting about 3-4 volts when the
   switch was put in the down position, and the other contact got 11-12
   volts when the switch was put in the up position, but no movement in
   either direction regardless.
   The passenger side window works fine and the motor has the same 11-12
   volts at either post depending on the switch position - up/down.
   All fuses are good.
   Any thoughts on where to look for the problem?  Or suggestions on how
   to further diagnose?
   I cannot see any break in the wiring or a poor connection somewhere.
   Again, could this be a relay issue?  The stock wiring harness appears
   untouched in this area behind the switch console and under the dash.
   I have not yet tried running a jumper wire directly to the motor from
   the switch.  I suppose that should be my next step.
   Again, open to any ideas. Can't really drive the car anywhere if I
   can't close the windows and lock it up.
   Cheers!
   Garth