my power windows have been loose from their sliders for some time now. Annoying but never a huge problem I could always guide them in.

A new issue has arisen though where I think the BMW is setting a limit on how far down the windows will go. They go down about 20%.
I'm presuming this is a "convenience feature" to pre-set window limits however I would like to reset and have my power windows go down completely.
1997 BMW 318ti

Any suggestions?

thanks
jay