2003 GMC Envoy Owner's Manual - Page 350

A 6. Put the blade assembly pivot in the wiper arm hook. Pull up until the pivot locking tab locks in the hook slot. 7. Carefully lower the wiper arm and blade assembly onto the windshield. Backglass Wiper Blade Replacement See Windshield Wiper Blade Replacement on page 5-53 in this section for instructions on how to change the backglass wiper blade. The backglass wiper blade will not lock in a vertical position like the windshield wiper blade, so care should be used when pulling it away from the vehicle. B C/ A. Claw in Notch B. Correct Installation C. Incorrect Installation 5-55