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Originally Posted by HotZ28
What we have here is, you used a resistor key to bypass the decoder module and started the engine. Once the resistor key was removed, the engine will continue to run! Anytime the PassKey module detects an incorrect resistance after the engine is running, the PassKey module will allow the vehicle to be restarted, even with the existing failure. The SECURITY lamp will remain on, to warn the driver of a fault in the PassKey system. Word of caution here, operating in this condition also means that the vehicle can be started without the correct key resistance, and is defenseless against theft. (This may, or may not be a problem in Maine)  The ECM will also display error code 53 while in this mode. This error code does not store in VRAM memory and is only present while the condition exists. The code only serves as a diagnostic tool while troubleshooting the VATS system.
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My point is, how really secure are these Passkey systems???? A thief can walk up to a car with 15 different resistors GM used on these systems, try em till one works and drive off with your car. I dont know where your from, but where i am in Maine there is a difference. A thief would have enough time to do this and might be seen by a deer or other wild animal. No biggie with a code 53 or security light for me. The car starts and goes down the road. No money spent, no tows to the stealership. Its a 1993 Buick LeSabre. If someone wants to steal it, that means they want it more than i do. If it does get stolen, i'll return the bottles i have collected at the local redemption center and buy another one. A newer one might be worth stealing. The other day i saw a moose cruise by in a 2005 and he was being chased by a mountain lion in a Crown Viki.