IIRC, The “plus” bit of the S5+ is a remote immobilising facility to stop someone who’s nicked your car with the keys starting it once you’ve reported it as stolen.
It’s a different thing to the car’s built in immobiliser.
Got myself one of these to tide me over until the Emira gets here:
Shall we play a little game?
Any guesses what it is?
A clue - it’s got a ”4” in the name. ;)