The videos on this page link to those made by INEOS to explain how to operate our Grenadiers. The first that I would recommend you watch is the one on the left, which covers how to operate the Transfer Case and Diff Locks, plus all the other off-road controls on the Overhead panel.
Below this video are snap shots of specific controls. All extremely useful videos.
The source of the videos is this page; CLICK
EXTERIOR VIDEOS from INEOS
INTERIOR VIDEOS from INEOS