General Motors Vehicle Anti-Theft System (VATS) is most noticeable by the “black chip” in
the blade of the key. Originally installed in Corvettes as early as 1986, it was still in use in
the Corvette in 2004. It has been used in all GM brands. VATS is a General Motors (GM) security system that has a resistor embedded in the blade of the key. There are 15 different resistors in the single sided configuration, and 14 different resistors in the double sided configuration. There is a three minute penalty for using the incorrect resistor.
Normal operation is for the key, with resistor pellet, to be inserted and turned. If the correct resistance is read, the VATS Module, through a relay, will allow the starter to crank the engine and also send a signal to the ECM to allow the operation of the fuel injectors. Without the correct resistor the injectors and starter are inhibited.
The security derives from the fact that there is a one-in-fourteen / fifteen chance of having the correct resistor. The worst case scenario when the penalty is invoked (3 x 15) is 45 minutes. This discourages, but does not eliminate, the theft of the vehicle.
At Mr. G Locksmith.com we have the equipment to originate and duplicate your VATS keys.