2004 Toyota Sienna latches & locks problems

When the sliding door window is rolled down on the driver-side non-powered door, the sliding door does not latch in the opened position..thereby making the sliding door to slide close automatically causing injury to passengers especially children getting off the van.

I have a 2004 toyota sienna minivan. It has two power sliding rear doors that use a cable to open and shut. Over the past few months there has been a grinding noise coming from both doors and recently, one of the cables finally snapped, resulting in the door to be unusable. I am being told by toyota this is a $1200 repair as the whole door mechanism needs to be replaced, despite the fact the only problem is the snapped cable. This repair is only for one of the doors.