four possibility's , arm position wrong park switch timing, broken link spring, parking spring release. First step GET A FACTORY SERVICE MANUAL, Has great pictures and info. Usually on line available $40 - $70. When operating the low position of blades should be about 2 1/4 -2 3/4 above molding. that leaves room for at rest position when turned off. Crank arm (that linkage attached to motor that wiper transmission attaches to - should be pointed up toward windshield when completely stopped. turn motor on and off make sure crank arm on the motor is correct. Connect transmission there is a great picture of this on page 8-82 in the manual. Maybe you can get a picture of that page on line. BUT buy a manual anyway! With arms and blades removed. If cam assembly is good, when you turn motor on watch the pivots, let it run several cycles. When you turn the switch off (do that when blade would be in an up position), wait, the pivot will stop, then move again to the rest position. Now put on an arm/blade assembly. and retest. Each time you turn on make sure the wiper operates thru several cycles before turning off. IF you shut the switch off with the wiper blade JUST Slightly passed top of pattern, they should stop about half way back down. If it takes 1 1/2 times may need cam assembly. that goofy looking assembly is what causes it to go to rest.