Wiper Blade: Testing and Inspection
Wiper Blade Element Check
Remove the wiper blade from the arm. Refer to Windshield Wiper Blade Replacement (Removal and Replacement).
Look down the length of the wiper blade element. The rubber part of the wiper blade element (2) that contacts the glass, must be on the center line of the wiper blade, plus or minus 15 degrees (1).