"D", "4" Positions Fourth Gear

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

The direct clutch is coupled, and the rear carrier and rear sun gear are connected.
The high and low reverse clutch is coupled and the mid sun gear and rear sun gear are connected.
The input clutch is coupled and the front internal gear and mid internal gear are connected.
The drive power is conveyed to the front internal gear, mid internal gear, and rear carrier and the three planetary gears rotate forward as one unit.

Fig 1: Power Transmission Diagram (D, 4 Positions Fourth Gear)
Courtesy of NISSAN NORTH AMERICA, INC.