GMC 2014 Yukon/Yukon XL Owner's Manual page 367

1. Lift the wiper blade assembly up
and out of the park rest position.
2. Pull the wiper blade assembly
away from the backglass. The
backglass wiper blade will not
lock in a vertical position, so
care should be used when
pulling it away from the vehicle.
3. Turn the wiper blade assembly,
and pull it off of the wiper arm.
Hold the wiper arm in position
and push the blade away from
the wiper arm.
4. Replace the wiper blade.
5. Return the wiper blade assembly
to the park rest position.
If the windshield or front side glass
must be replaced, see your dealer
to determine the correct
replacement glass.
Headlamp aim has been preset and
should need no further adjustment.
If the vehicle is damaged in a crash,
the headlamp aim may be affected.
If adjustment to the headlamps is
necessary, see your dealer.