Bypass Security System on 91 Camaro - Third Generation F-Body Message Boards

upanddownal56 · 10-27-2009, 02:06 AM

I purchased a 91 RS Camaro 305 V8 TBI that caught fire and burnt wiring harness under hood. Have replaced complete wiring harness and all other components under hood that were damaged due to fire by using parts from other 91 camaros. The camaro I purchased was sold without a "chipped key". I have tried another ignition with a chipped key but car still will not turn over or start. I need information on what has to be done in order to bypass the chipped key security to make car turn over and run. Please help with any information or location of components needed to resolve the problem. As I am not very familiar with the 91 camaro and their security systems, all I know is I have everything new in it to run but just need the technology to start it. So does anyone have any input? Please Help!!

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irocturn&burn · 10-29-2009, 10:19 PM

you can try putting the PATS (passive anti-theft system) lock cylinder and key back in abn also install the pats control module that came from the same car the lock cylinder came from. it looks like a little computer. that way the key is putting the correct resistance to the module to allow it to crank. that module should be hidden way behind the dashboard on the passenger side. like remove the dashboard hidden. All the "chip" is in the key is a resistor and the resistance is vehicle specific, that is what makes it not start other vehicles the pats control module wont enable crank if the resistance does not match. hope this helps

Mike M · 10-29-2009, 10:26 PM

Read the thread from 10-26 titled "VATS resistor value". It has all the resistor values listed. Rest assured once you satisfy the PATs or VATS module it will start.

camaronewbie · 10-30-2009, 10:41 AM

Absolute easiest thing is like said above - get the resistance values off that thread, go to radio shack and buy one each resistor, follow the vats guide under the tech articles section off the main page here and put in the resistors one by one until you find the one that allows the car to start. Then you know the resistor value - you can either solder that resistor in and be done with vats, or go to ACE hardware and have a key cut for your ignition with that value chip for $25 and keep using the vats.