In my service manual under General information-Wiper. When the wiper switch is turned off. The motor direction is reversed to rotate the parking cam 180 degrees, changing the length of the drive link/ crank to park the blades in a depress position. My book's do not show the parking cam. I have two manuals # 81-270-2001 and # 81-270-1001. The parking can isn't in either book. I don't know how it should look when installed properly. Can somebody help me with this? Lawrence R Noska lnoska@xxxxxxxxxxxx Hauser, ID 83854