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Your find what code is stored in the BCM , do the diagnostic's ,fix the problem then the light will go off ! Or you can do by-pass of ignition an hope that is the problem . These VAT'S systems have a tendency for wire's breaking at back of the ignition switch ,you can test with a ohm meter . That is if your key has the pellet on the side . You measure the pellet with ohm meter , find wires under the dash . two White wires with a yellow sheathing over them . Stick the key in the ignition check for ohm's resistance ,should be same as key pellet . If no reading ,go to radio shack buy resistor of same value an solder in wiring harness ,body harness .
The security, antitheft or lock picture/icon 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 misinterprets 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 explains it pretty well. http://www.diy-gm-security.com/
This module will permanently delete the VATS system forever!
check all of the bulbs on that side 1 of them my not be working(it may light up but not flash because some of those bulbs are combo bulbs)meaning that some turn signals are used by part of your tail lights or break lights.
The security system (VATS/Passkey) installed on these GM cars is anti-owner more than an anti-theft. There are 3 parts involved:
The lock cylinder
The TDM (aka the brain of the system)
if any of these parts fails or is even slightly malfunctioning, the car stays stuck where you are and you only get a dealer asking you about 1,000$ to fix it. And all the 3 parts have a quite short lifespan.
Way too many people got in this situation (including myself). I don't recommend any partial solution or any used parts as it would happen again way too soon to be acceptable and if it happens 100 miles from home (like it happened to me....) it's a big burden.
I finally made it to save my beloved 94 Park Avenue (with the exact same system that is installed in your car) with a solution that I found on the internet and that bypasses the entire factory security system, all 3 pieces altogether and you can even remove the TDM at the end and use 99c keys without chip. The product I used is at http://newrockies.com and is still working perfectly after 5 years. Don't go to the dealer!
Yea the car is in lock down mode. Something triggered the security system, and as a result, the computer engaged the ignition kill. Disconnecting the battery alone wont solve the problem. What I would suggest is call a local Chevy dealer and ask to talk to a technician, they know the procedure and can walk you throuogh it right over the phone.