I was referring to older VES DVD player located under the climate controls, it has a button to lock the remote, and a button to lock the headphones. Not sure when they "phased out" the older VES but I saw a 2012 and a 2013 and they had the old VES DVD player.The lock button down by the hvac locks out the rear ac controls. Nothing to do with the screens.
The only lock could find prevents the remotes from working. There is a Lock button on the input select screen, and pushing it, accepting the info pop-up, you get the outline of a remote with a red line through it up in the top right.
I can't find any other locks.
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