HI THERE
I HAVE EXACTLY THE SAME ISSUE (ENGINE THAT WON'T SWITCH OFF PROBLEM WITH MY 2013 200 SERIES 4.5 V8 DIESEL CRUISER AND IT HAS EXACTLY THE SAME SYMPTOMS AS YOU WERE HAVING !! EVEN DOWN TO THE PASSENGER SEAT HEATER SWITCH LIGHT FLICKERING !!
IT WOULD HELP ME MASSIVELY AND I WOULD REALLY APPRECIATE IT IF YOU COULD LET ME KNOW IF YOU EVER DID GET YOURS SORTED AND WHAT THE ISSUE TURNED OUT TO BE !!
MANY THANKS FOR YOUR TIME AND HOPEFULLY I WILL HEAR FROM YOU VERY SOON !!
KINDEST REGARDS KIRK IN THE UK !!