Question about 1995 Oldsmobile Cutlass Supreme
The security 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) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.
Posted on Feb 11, 2012
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Posted on Jan 02, 2017
With the new lock cylinder in it, turn the key on. The security light should blink. Leave the key on for 10 minutes, the security light will quit blinking and go out after 10 min. This will reprogram your security system and the car should start. Also leave a battery charger on it while the key is on, If the battery goes dead during the 10 minute reprogram sequence, you will have to start over again.
Posted on Mar 08, 2009
had same problem in 99 aurora. fixed it here
from the above site:
It worked well for me for about ten years, but I finally got fed up with not being able to start my own car with my own key. I don’t like to get screwed on car repairs, so here’s what happened. I used Google for a while and found some websites with more information than I really needed, and I read it all. If you are having the same problem, you have probably figured out what is going on. You turn the key. The car doesn’t start, but the ‘SECURITY’ indicator blinks. You give up, and it stays lit. You know that the little resistor in the key is not making good contact. You can go Google for those other sites as well, but you really don’t need all the information they give. I had been putting off the job because I thought I was going to have to crack open my steering column. This was not the case. Here’s how it worked on my 97 Camaro:
Posted on Sep 29, 2009
If the previous solution doesn't work, try this:
While the key is in "on" position and your security light is blinking, it is probably your "Passlock" security device acting up. Very common in these years for GM cars. To test if this is it, simply turn your key forward (to "on" position) until light stops blinking and eventually turns off (right around 10 minutes). Then, turn key back off, and then try to restart it. My Alero did this just a few months ago and I learned this trick as I was pricing out a new fuel pump. If this was your problem, I recommend taking it to a remote starter installer and have them by-pass the passlock system permanently. This should cost anywhere from $40-$100, but is much better than a new fuel pump and filter cost.
-note: I recommend not getting it by-passed until it happens a second time (which it may not), just don't forget the temporary fix!
Posted on Jan 14, 2010
SOURCE: what happens when the car
Your vehicle is equipped with the Passlock theft-deterrent system.
Passlock is a passive theft-deterrent system. Passlock enables fuel if the ignition lock cylinder has not been tampered with.
During normal operation, the SECURITY light will go off approximately five seconds after the ignition key is turned to ON and the engine is started.
If the SECURITY light flashes with the key to ON, wait 10 minutes until the light goes off. Then turn the ignition to OFF before attempting to start the engine.
In an emergency, call the Oldsmobile Roadside Assistance Center at 1-800-442-OLDS or 1-800-442-6537. (In Canada, call 1-800-268-6800)
Posted on Oct 25, 2010
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