I plan on finding the source of the light show but I'm confused with why some have experienced that removing the ARC control unit disables all the lights. I had done that in my older car and everthing still worked with no rewiring.
As Jes has stated, removing the display won't do anything, but the control unit will.
If you look at the wiring diagram I've attached, it's off the rear external lighting. Every marked as an 'E*' is a light, if you follow them you'll notice they all juncture at the large box on the top right labelled 'N22' - N22 is the ARC Control Unit, and then C11 is the ARC Display. So you can see from that why you can remove the display without drama, but taking out the whole box itself will kill a lot without rewiring. Worth it in something like JJ's 3.7 where he replaced everything with a Painless Wiring kit, but hardly worth it for any street or general track car imho.
Usually though, the light show is always caused by bad grounds. If it's a single continual light, it normally means either (a) you actually do have a problem with whatever is being indicated or (b) the sensor itself has failed.
ROCK ON
R~R