Kann mir eigentlich nicht vorstellen, dass das Thema in den letzten 2 1/2 nirgends mehr behandelt wurde.
Jedenfalls findet sich im Handbuch folgende Anleitung:
Front Windscreen Wiper Blade
Replacement
T o replace the windscreen wiper blade, put it in the service
position before operation.
1 With the bonnet closed, tap the icon on the
entertainment display and select 'Status - Power Off'.
Within 20 seconds after power-off, press down the
wiper stalk switch to the Single Wipe position (see
'Wipers and Washers' in 'Instruments and Controls'
section) and release, the wiper will automatically move
to the service position and stop on the windscreen.
2 Lift the wiper arm away from the windscreen.
3 Press the button on the wiper arm (as illustrated),
and pull the upper end of the wiper blade outward to
disengage from the wiper arm.
4 Unhook the blade from the wiper arm and discard.
5 Locate the new wiper into the slot of the wiper arm.
6 Push the wiper blade towards the wiper arm until the
wiper blade is fully embedded.
7 Put the wiper assembly back onto the windscreen, and
check whether the wiper blade is fixed correctly onto
the wiper arm.
8 When the vehicle is powered on (refer to 'Starting
and Stopping Power System' in the chapter 'Starting
and Driving'), the wiper will exit the service mode and
automatically return to its original position.