NISSAN 2012 Armada - Owner's Manual - Manual (Page 362)

*2: While changing in and out of 4LO, the ignition switch must be ON and the vehicle’s engine must be running for a shift to take place and for the indicator
lights (4WD shift and 4LO position indicator) to be operable. Otherwise, the shift will not take place and no indicator lights will be on or flashing.
*3: Make sure the transfer 4LO position indicator light turns on when you shift the 4WD shift switch to 4LO. The indicator light will also turn on when
4LO is selected. See “Vehicle Dynamic Control (VDC) system” later in this section.
Starting and driving 5-25