HELP! The start button on my 05 STS fell off yesterday and I couldn't get the car to shut off; took it to a dealer and they finally disconnected the battery cables. Their scanner said something might be amiss with either the PMM, IPM, or BCM. The car is now "stuck" in accessory mode even when the battery cables are disconnected, touched together, and reconnected, and the ignition button assembly is unplugged. In other words, the car thinks it's constantly in accessory mode, and I can't start it even with the remote start and the entire ignition switch/button assembly no longer works.. Any suggestions as to what to do/try/mess with before I spend several hundred on one or more of the above modules? Comments, etc. are much appreciated. Thanks, Jeff.