What would be the average cost to fix my manual car window at my Toyota dealer? on 2001 Toyota Corolla

Both rear windows no longer go up or down when the window crank handle is used. I have a Toyota 2001 Corolla CE.

Asked by for the 2001 Toyota Corolla
No way to tell without looking at it could be lots of things. Ckeck handle for
striped splines.
Thank you for responding