have a duplex of futura cars, one car has been intermittently getting a 45 fault, the mechanic says that he has checked doors, replaced io modules for door circuit etc. now both cars are down with the same error, 45 they will reset and run for a couple hours and then both cars down again with 45 error, i will be heading out there monday any ideas for me to look at seems like a simple error doors closed but dcl not making