the entire unit can be disconnected, it lives under the rear seat base squab and if its unplugged, no abs or light is shown. My brothers previous vr6 had a weird abs fault in that over 20mph, the abs would start braking by itself, under 20 no reaction, so we pulled the main plug out of the controller and that stopped it, no lights were shown after that.
The previous owner may have had the same problem, and done the same thing, tho as has been said, could have been down to a sensor signalling that the wheels were spinning free hence it tried to brake to control wheelspin that wasnt happening...
