They are not on the same fuse as the seat heaters, theay are on their own dedicated fuses F17 and F18 in the rear compartment, top row of fuses first two fuses from the left side. Don't believe your fuse diagram in your manual or in the workshop manual, go by the sticker on the fuse panel. The 06 is a red headed step child, and alot of the info in the owners manuals and workshop manuals don't apply to them. A lot of the owners manual pages were copied and pasted from the 05 manual even though alot of the details (like fuses) changed. This is a picture of the sticker on my 06 rear fuse panel.
https://www.rangerovers.net/forum/a...rness-install-2007-sc-img_20180723_151056.jpg
https://www.rangerovers.net/forum/a...rness-install-2007-sc-img_20180723_151056.jpg