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sounds like gem module I had a 2001 did the same took batt cable off for 10 min and put back on and it worked for awhile it's the anti theft module a dealer can remove in for $ 150 hope that helps hope that helps
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/
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/
Perform the re-learning procedure
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY light, after approximately 10 minutes the light will turn OFF.
Turn OFF the ignition, and wait 10 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle
is now ready to relearn the Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).
Start the engine (the vehicle has now learned the Sensor Data Code and/or password).
These cars and many many many other gm cars and trucks are equipped which an antitheft feature. Many times on engines swaps and ignition changes, this system gets interrupted because the computer is not seeing the proper signal from the original equipment. Try to start the car, when it doesn't turn over, leave the key in the "on" position. Look for a light near your gauges that says "security" or "antitheft". If you see this indicator light, then the problem is definitely the antitheft system. Fixing it is rather expensive. Bypassing it is relatively cheap. This link explains everything you need to know.
yes, the anti theft system runs thru the radio. Either the radio is going bad and causing the antitheft to kick in, or the antitheft is bad and faulting the radio. I just went thru this in my girlfriends 01. Ended up installing after market radio and bypassing the security system. I bypassed thee antitheft security first, and the car worked just fine, but I didn't get any radio till I installed a new radio.
Here Is a link to help with the antitheft
http://vatspasslockpasskeysecurityhelp.yolasite.com/
Unfortunately this is an all too common problem on GM vehicles. The car's antitheft system is failing or worn out. It is actually turning parts of the car off on purpose. (Starter and/or Injectors) It does this because with the antitheft system not funtioning correctly, it thinks its being stolen. The SECURITY light proves this. The good news is that you can bypass this antitheft security feature relatively easily and hundreds of dolllars less than taking this problem to the dealer/mechanic.
This link explains the problem and offers some DO IT YOURSELF solutions.
Alot if the time when the cluster turns off, it kills the power to the antitheft system. When their system can't read the key, the car goes into antitheft mode. 2 options. Fix the dash, or bypass the security system. Here us the security info.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
When it doesn't start, is the security light and maybe the battery light flashing?
If yes, it's probably the PassLock security system. I just bypassed mine on my 2002 Impala. There are several websites with information and possible solutions; including spending several hundred dollars at the dealer, to a do-it-yourself bypass for a couple dollars.
in the center of the dash you have a flashing red light when car is not on looks like alarm system. if that light is flashing or stayting red while cranking you have a antitheft problem
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