Passenger Seat

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Remove the headrest.
Remove the seatback board from the back of the seatback.

Fig 1: Removing Seatback Board From Back Of Seatback
Courtesy of NISSAN MOTOR CO., U.S.A.
Remove the retainer.

Fig 2: Removing Retainer
Courtesy of NISSAN MOTOR CO., U.S.A.
From inside of the seatback, squeeze the headrest holder tabs at the base of the stay pipe and pull up to remove.
NOTE: Before installing the headrest holder, check its orientation (front/rear and right/left).

Fig 3: Removing Headrest Holder Tabs
Courtesy of NISSAN MOTOR CO., U.S.A.