SMART forfour Owner's Manual page 106

Windscreen wipers
104
X
Turn wiper blade ; in the direction of
the arrow until it is released from the
retainer on the wiper arm.
X
Remove wiper blade ;.
Fitting a wiper blade
X
Push new wiper blade ; onto wiper
arm : until you feel it engage.
X
Turn wiper blade ; parallel to wiper
arm :.
X
Make sure that wiper blade ; is seated
correctly.
X
Fold wiper arm : back onto the rear
window.