First, your key can be "read" in a VATS tester. Remember, there are 15 differrent possibilities. There are basically two ways to determine what VATS key you have. If the wrong chip is read, the VATS module will tell the starter and the fuel pump to shut down.īy chance you may know what VATS key you now have. If it is the correct chip, the VATS module will tell the starter and the fuel pump to operate. When the proper mechanical keys, along with the proper VATS chip (resistor value) turns the ignition lock, the VATS module reads the chip on the key. Each VATS module is randomly given a # (value) from the manufacturer. Each car has a VATS module (Brain) under the dash that communicates to the starter, fuel pump, and the ignition lock. But the cuts alone will not allow the car to crank. Just by looking at the keys you can’t tell the difference.Įach VATS key has it’s own unique cuts on the key to operate the lock. GM uses 15 different resistors in their VATS keys. GM first started using the Vats key in 1986 on the Corvetts, then some of the Cadillacs, ect. The black chip on the blade of the key, is actually a resistor. But because of the popularity of calling it a computer chip key, so will we. This key or "Chip" has nothing to do with a computer, nor is it a chip. ![]() Lots of people refer to this type of key, as a " computer Chip key". Vats stands for Vehicle Anti Theft System. With that out of the way, here's an explanation of the VATS system (which I culled from a locksmith selling VATS blanks on eBay.) Please follow the links at the end of this document for further help. Just to reiterate: I am not an expert on this system, and know nothing more than how to bypass the "reader" in the ignition lock cylinder. Using a Factory Service Manual, I located the wires in question and created the "resistor pack" to jumper accross them. On my 92 LeSabre, the wires running from under the dash to the "reader" broke inside the steering column, and I didn't feel like pulling the column apart to fix or replace the lock cylinder. I simply stumbled across a way to bypass a malfunctioning "reader" in the ignition lock cylinder. ***Now that being said, I want to stress that I am not an expert on the VATS system, by no means. A thief will be able to steal your car much easier than if the VATS system were enabled. **NOTE** After performing the following procedure, your vehicle's factory starter interrupter (VATS) will be disabled. If that also doesn't work, then follow my instructions for a fast, simple, and relatively inexpensive repair. The simple solution is to first clean off the chip on your key or try another key for the same car. ![]() ![]() When you insert your ignition key and attempt to start the car, will the car not even attempt to crank over? Does the "Security" light flash during any time you're attempting to start the car? This document pertains to the following vehicles:ġ992-1999 Eighty Eight/LSS/Ninety Eight/RegencyĪny other GM Vehicles with the VATS or PASSKey II system (If your ignition key looks like the one pictured below.)īefore we begin, here's a question to ponder: How to bypass the VATS (PASSKey II) system in a late model GM vehicle
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