Vehicles with third head rest:

Remove center head rest -1-. See Fig 1.
Fold center arm rest downward and open ski sack cover.
Unclip screen -3- at bottom by trim -4-. See Fig 1.
Remove bolts -5- (8 Nm).
Press button -2- to insert center head rest. See Fig 1.

Fig 1: Inserting Center Head Rest - Rear Seat

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Courtesy of AUDI OF AMERICA, INC.