It is explained on page 62 of the Owners manual. The right hand lever on the steering column operates the front & rear wipers. Push the button on the end of the lever to operate the rear wiper. Push the lever towards the dashboard to operate the rear washer. There is a graphic on the top of the lever that shows this. Pulling the lever towards you operates the front washer.
If you get nothing then your reservoir is empty. Fill it up with some washer additive and if it still is not working go back to the dealer & get it fixed.
Rear Windscreen Wash and Wipe*
When the START/STOP switch is in the
ACC/ON/RUNNING position, the rear wipers and
washers can operate.
INSTRUMENTS AND CONTROLS
Intermittent Wipe
Press the intermittent wipe button and release, the wipers
will wipe three times at once, then intermittently wipe,
and press the intermittent wipe button again to turn off
the intermittent wiping. Toggling the automatic wipe speed
adjustment switch can adjust the time period between the
Intermittent wipes.
Wash/Wipe
By pulling the lever switch towards the instrument, the rear
window washers will operate immediately.
The wipers continue operating for a further three wipes
after the lever is released. After several seconds, there will
be a further wipe to remove any fluid draining down the
screen.
Note: When the tail gate is opened, rear wiper
operations will be disabled.
Note: After the windscreen wipers are switched on, if
the shift lever is in “R” position, the rear wiper will
operate.