GM's PASSlock II, FORD's SecuriLock, CHRYSLERÃ¢â‚¬â„¢s SentryKey and TOYOTAÃ¢â‚¬â„¢s Engine Immobilizer - These transponder based anti theft systems consist of a computer chip imbedded in the ignition key itself which emits a signal to the vehicleÃ¢â‚¬â„¢s computer system in the steering column to identify the "real" ignition key and allow the vehicle to start. These systems are factory installed, on almost all the new GM, FORD, CHRYSLER and TOYOTA vehicles, at no charge. These systems keep honest people honest and are very easy to bypass. All a thief has to do is cut the black wire in the three wire ribbon cable located under the dash and measure the resistance between the black wire and the yellow starter wire with a volt meter. They then touch the two wires with the matching resistor and the vehicle will start. This sounds complicated, but only takes about 20 seconds to defeat . . . which is probably why the factory installs these systems free. These systems are not very effective and they are bypassed all the time. Recently, a national automotive magazine published information on how to bypass these systems. Some salespeople tell their customers that because of this factory installed system, they do not need any extra security for their vehicle, but this is NOT TRUE!