I have a similar problem and traced the cause to broken wires in the run
between the driver's door and the body of the Van. I discovered that if I
held down the (non-working) switch in the driver's door and wiggled the wires
that go from the door to the Van I could get the window to work if I hit the
right spot.

Good Luck
Todd
'88 Westfalia

Steve Beyer wrote:

> Maybe someone with more electrical smarts can help me out . . .
>
> The passenger window on my '91 MV:
> ---goes up but not down when operated by the passenger door switch
> ---does nothing when operated by the switch on the driver's door
>
> The motor checks-out OK.  When I disconnect the wires and reverse the two
> leads the "up" position will lower ther window.  So I've ruled-out an
> electrical motor problem or a "binding" window problem.
>
> I replaced the switch in the passenger door with a switch from a Jetta.
> Same problem.
>
> Then I replaced the switch in the driver's door with the old switch from
> the passenger door. Same problem.
>
> A little background: the passenger window occasionally did not respond
> immediately (you would have to hold the switch, particularly when
> operated by the switch on the driver's door), prior to failing
> completely. And the driver-side door had to be closed in order to operate
> the passenger window from the driver's door.
>
> Do I have a fried or broken wire between the two switches? Could both
> switches fail at the same time?
>
> The driver's side window works fine.  Should I be satisfied that half of
> my power windows work properly?
>
> VR,
> Steve Beyer
> skypilot@coastalnet.com