You are spot on Hector. On the door sill, where the door lock latches,
there is a switch you can press in. My functioning window glass moves
the inch up and down when you press it with the door open. It doesn't
do this on the affected side. Obviously, there is some sort of a sensor
that isn't working. I am going to take it to a BMW garage (an
independent one) to have the estimate. I guess the whole unit housing
will need o be replaced. I will let the group know about the damage!

Thanks,

Vijay
Hector wrote:
> I'm no expert, actually, I'm new to this group since I'm a recent BMW owner.
> But I can give you my thoughts on this issue. My son has the same car ('99
> M3 coupe).
>
> I assume that since the window raises and lowers with the switch that the
> motor is good. Unless there's a separate circuit on the motor dedicated for
> locking the window. On the other hand, there must be some type of switch or
> sensor that can tell when the door is completetly closed and commands the
> window motor to further close up. I would suspect that this is the problem,
> but without looking at the schematics it's only a guess.
>
> good luck... and if you find what's the culprit let me know.
>
>
>
> "Vijay" > wrote in message
> ups.com...
> > 1996 EVO M3 UK 118,000 miles.
> >
> > Normally, when the door is shut, the glass window raises a little to
> > effect the airlcok and when the door opens, it lowers itself an inch or
> > so. This is for airtight locking of doors, I presume.
> >
> > My passenger side window stopped doing this suddenly. The electric
> > controls work normally and I can raise or lower thw windows with the
> > press of a button but the window doesn't raise itsefl that last inch to
> > effect the airlock. At motorway speed, there is the whining air noise.
> > The driver side window works fine.
> >
> > Anythoughts as to what can be wrong and if it will be expensive to fix?
> >
> > TIA
> >
> > Vijay.
> >