96 acura rl windows on 1996 Acura RL

the back windows to my 96 acura rl wont work. how can i diagnose and fix the problem.

Asked by for the 1996 Acura RL
new motors from a junk yard
3 more answers
new motors from a junk yard
here is a link to a repair manual site that is really good, there is a small fee.
the motors, new are about $160/ not installed. they are part of a dealer service bulletin. apparently all cars are affected in that year. normally the rears go out first. dealer may fix it. check for bulletins