Question about 1991 Chevrolet Camaro

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Vats resistor value for 90 pontiac firebird ign key 46b7 key cut 243135

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The security, antitheft, or passlock light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.

Posted on Apr 27, 2013


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SOURCE: VAT key not reading, my key reads 10.55 k Ohms.

turn it off and let it sit for 30 min

Posted on Jul 03, 2009

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SOURCE: vats replcement

The resistor will just bypass key and lock, while the core of the VATS system will remain in the loop. Unfortunately the problem will come back.
There is an easy DIY way of bypassing the VATS system entirely, including the TDM (that goes faulty very often with the age of the car). You can find the write-up here:

Posted on Jun 18, 2010

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Starter wiring diagrams


hope it helps I suspect that you have a starting problem usually there is 2 little wires Inside column steering connect to cyllinder key are cut
you can test it at the end of steering column 2 very little yellow wire ...put key in ignition cylinder and with ohm meter take resistor value if none wire is open circuit.

Jul 02, 2014 | 1994 Pontiac Firebird

1 Answer

My 1993 firebird was running fine after changing ignition switch and now it will not crank? told it was the vats key mod. need to know how to bypass it and where its located

Is there a pellet in the key. This type can be bypassed the pellet pushes to resistors outward to a given value from #1 to #14 if you can read key resistance then go to a electronics store a by a resistor that value now crawl under dash by gas pedal you will find a orange cord with two white wires in it place resistor across both wires and cut wires off leaving the ones going up steering column open. turn key on if security light is flashing wrong resistance value. try again. a haynes manual should have all resistance values but key code.

Nov 12, 2013 | 1993 Pontiac Firebird

1 Answer

I have a 1991 Firebird and lost the key, i had a key made from the dealer and the dealer could not find the vats key code said it didnt have one, so he cut a key to the specs provided by gm and the key...

You can bypass the vats rather easily. You can also try buffing that key down a little bit. As with any key, sometimes they are cut too sharp and need to be filed or buffed down a little to mimic normal wear and tear. Here is a link on the Vats security system.

Feb 07, 2012 | 1991 Pontiac Firebird

1 Answer

My theft deterrent module isn't working, therefore my vehicle will not start. how can i bypass the TDM without having to pay an arm and a leg to do so, so that my car will run again?

Does that still have the old style key with the silver "chip" that can be seen in it? If so then this is very simple.
Its most likely not your VATS/Pass Key II module. The weak link in these systems is the lock cylinder. There are two wires that are connected when the key is inserted. But that "chip" is actually a resisistor. The two wires move when the key is turned and over time they will break.

There are modules to buy that can completely bypass the VATS system (a true bypass). They were made for engine swaps into vehicles that did not have the key and module or the resistance value was not known.

But since you have your key, a cheaper way to do this is to bypass the key's resistor and install your own.

You need a multi meter so you can measure the resistance of the key pelet. These are the values of the 15 different keys in the VATS.
1---- 0.402
2---- 0.523
3---- 0.681

Locate the orange wire harness. Its a thin harness that comes out of the column near your feet when sitting in the car and will have two small wires inside. Sometimes white, yellow or even black.
.madmikers_9.jpg With the key in the ignition lock (does not have to be on) you can measure the resistance between the two wires. It should read the same as the pelet in the key. If not then the wires are broke oe breaking.

If the resistance is not the same (or very, very close) cut off that plug and a length of the wire along with it.
Go to an electronics store and get a resistor or resistors that will total the same value as your key's pelet. The values can be off but not by much.
If more than one resistor is used attache them in series (one after the other) to the wires on the plug you cut off earlier, one end of the resistor to one wire and the other end of the resistor to the other wire. Solder them if you can.
Cover them with tape or heat shrink tube, plug it back in and try it out.

Sep 24, 2011 | 1996 Pontiac Firebird

2 Answers

My egnition will not allow me to put key in all the way

The lock cylinder must be bad.
Unfortunatly being an 89 it should be a cylinder with the VATS key. They are a bit costly. Around $75 if I remember correctly. Then if a VATS bypass has not been done (not really a bypass of the VATS, just a bypass of the key's resistor) then you need to get a key made with the proper resistance for the new lock. The bright side is the new lock cylinders come with a key already cut so it just needs a copy or thkey with the proper resistor.

I don't know if non VATS key cylinders fit into the column properly because I have only done the repairs with the right parts.

I think has the proper lock cylinders at a desent price. If you do a web search for rock auto discount codes you can save a few bucks as well.

Sep 15, 2011 | 1989 Pontiac Firebird

1 Answer

I havw a 1997 firebird security light comes on and car won`t crank. Keyfob does nothing. Could it be the antitheft module?

Been there: had broken wiring in the key cylinder -- wouldn't read the 'chip'. Dealer dinged me for a whole assembly, meaning a new key-cut .. and new IGN keys !
Learned later that I 'could' have bypassed the chip-reader with $1.59 of resistors from RadioShack ..

Jul 23, 2011 | 1997 Pontiac Firebird

1 Answer

How to bypass a keypass security module in a 1992 pontiac bonnevile

its a simple resistor in the head of the key... u need a multimeter to find the value of that resistor...then purchase a resister of the same value...try radio shack... and install it between the two vats wires...they are located under the dash and coverd by orange insulation.they are two small white wires....connect the resistor to the wires on the vehicle longer need the ignition side of the wires.. that should bypass the vats and no longer need the key with the resistor built in

Aug 26, 2010 | 1992 Pontiac Bonneville

1 Answer

Does the ign. key have a computer chip in it?

No. GM's vats system has a resistor in the ignition key. The Vats has a control module that needs to see the value of that resistor to start the car. If it doesn't see the resistance the car will crank but will not start up. Try your back up key. If that doesn't work the the Vats system needs to be replace. GM has only 15 different value resistors to A million different possible ignition key cylinder combonations.

Apr 05, 2010 | 1997 Oldsmobile Achieva

1 Answer

Key Won't Come Out of the Ignition

Theft System (VATS) or PASS-Key made all Firebirds more theft-resistant. In response to an escalating trend among car thieves to target the Camaro and Firebird. VATS incorporated a small resistor into the ignition key shaft which was read by a sensor when the key was inserted. VATS-equipped cars also displayed anti-theft system warning decals in the lower rear corners of the side windows.

Good Luck 

Mar 22, 2009 | 1990 Pontiac Bonneville

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