Here is a great write-up to completely bypass the VATS system. This was the only thing that saved my car. http://newrockies.ca/vatsbypass
how do i tell if the vat chip is the rite one for my sts?when i purchased it i baught it not running and was told it was the battery and possibly the starter,i did not have a battery at the time.when the vehicle was delivered to my home,i wasnt there to talk with the seller and when i arrived very shorty after the engine and hose's were warm and it smelled like running antifreeze!ive been unable to start the car since due to (antitheft problem) on info pannel.i suspect the seller switched the vat chip,again how do i find that out?your advise is EXTREAMLY appretiated thank you.
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I also understand that the same VATS keys are used on the following Cadillac models - the following info was gathered from sellers of the aftermarket sellers of VATS keys. Going price, out the door from around $18 to $30 for the set.
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Cadillac Allante 1989 1990 1991 1992 1993
Cadillac Brougham 1992 1993 1994 1995 1996
Cadillac Concours 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Cadillac DeVille 1991 1992 1993 1994 1995 1996 1997 1998 1999
Cadillac Eldorado 1989 1990 1991 1992 1993 1994 1995 1996
Cadillac Fleetwood 1992 1993 1994 1995 1996
Cadillac Seville 1989 1990 1991 1992 1993 1994 1995 1996
VATS # K OHMS
1â??â??â??â?? 0.402 (acceptable range .386-.438)
2â??â??â??â?? 0.523 (acceptable range .502-.564)
3â??â??â??â?? 0.681 (acceptable range .650-.728)
4â??â??â??â??-0.887 (acceptable range .850-.942)
5â??â??â??â??-1.130 (acceptable range 1.085-1.195)
6â??â??â??â??-1.470 (acceptable range 1.411-1.549)
7â??â??â??â??-1.870 (acceptable range 1.795-1.965)
8â??â??â??â??-2.370 (acceptable range 2.275-2.485)
9â??â??â??â??-3.010 (acceptable range 2.890-3.150)
10â??â??â??â??3.740 (acceptable range 3.590-3.910)
11â??â??â??â??4.750 (acceptable range 4.560-4.960)
12â??â??â??â??6.040 (acceptable range 5.798-6.302)
13â??â??â??â??7.500 (acceptable range 7.200-7.820)
14â??â??â??â??9.530 (acceptable range 9.149-9.931)
15â??â??â??â??11.801 (acceptable range 11.320-12.290)
WHAT IS VATS?
Vats stands for Vehicle Anti Theft System. Lots of people refer to this type of key, as a " computer Chip key". This key or "Chip" has nothing to do with a computer, nor is it a chip. The black chip on the blade of the key is actually a resister. GM first started using the Vats key in 1986 on the Corvettes, then the Allante, ECT. GM uses 15 different resistors in their vats keys.
How does the Vats System work?
Each vats key has itâ??s own unique cuts on the key to operate the lock. But the cuts alone will not allow the car to crank. This is called a mechanical key. Each car has a Vats module (Brain) under the dash that communicates to the starter, fuel pump, and the ignition lock. Each vats module is randomly given a # (value) from the manufacturer. When the proper mechanical keys, with the proper vats chip (resistor value) turns the ignition lock, the vats module reads the chip on the key. If it is the correct chip, the vats module will tell the starter and the fuel pump to operate. If the wrong chip is read, the vats module will tell starter and the fuel pump to shut down.
How to determine the Value of your key?
By chance you may know what vats key you now have. Most people do not. There are basically two ways to determine what vats key you have. Remember, there are 15 different possibilities. First, your key can be " read " in a vats tester. Most locksmiths have these readers, and donâ??t charge anything to tell you.
There is a way for you to read the key value yourself. If you have a Volt Meter you can test the OHMS (The Value) of the chip yourself. Just set your Voltmeter to check to 20 K OHMS Take each lead and place it on each side of the " chip " on your key. A number will appear. Take that number on your voltmeter and apply it to the OHMS chart below. Keep in mind that it may not be exact. Just pick the closest value to your reading.
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