Question about 1995 Oldsmobile Cutlass Supreme

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Car wont start security light flashing

Wont start

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  • Oldsmobile Master
  • 2,194 Answers

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.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Feb 11, 2012

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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csmock132
  • 4669 Answers

SOURCE: 2000 Alero Security light flashing and wont start

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

  • 1 Answer

SOURCE: can not start car security light flash fuse ok

had same problem in 99 aurora. fixed it here

http://mattwindsurfs.wordpress.com/2007/12/30/gm-pass-key-ill-pass/

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:

  1. Go to the electronics store and pick up a cheap multimeter. Open the box in the store and try to read your key with it. Quickly discover that this one is a total piece and you shouldn’t have wasted your money on it. Good thing you didn’t. Close the box and spend $50 on a real nice overkill version with auto-ranging. It’s still less than the $500 model.
  2. Leave the store and measure the resistance of the key in the peace and quiet of the hurting car. In my case it’s 886 Ohms. I’m no expert, but I bet GM picked values that don’t match up with widely available resistors.
  3. Well the store has 820. Will it work? I didn’t have the table I found online with the ranges about each of the 15 possible values in pass key. That’s OK. 1/(1/8200+1/1000) = 891. This is the resistance of an 8.2 kOhm and a 1 kOhm resistor in parallel. Don’t make this as hard as I did. Bring a calculator, or at least a pen. Buy the resistors and a 40W soldering iron.
  4. Here’s the action: twist the leads on the resistors together and solder them. Get down under the steering while and take all the screws out of the trim. Pull pretty hard on the trim to get it off.
  5. Literally the first thing you see is an orange wire coming out of the bottom of the steering column, housing two white wires. It’s plugged into another pair. One is black and white, and the other is purple and white. That pair is the car side. Cut it. Strip the ends and jury-rig twist the strands around the ends of the resistor.
  6. Try to start the car. It works. Try to start it again. It works again. Sweet. If it doesn’t work for you, go back to math and maybe buy more resistors. Better to get it close the first time.
  7. Solder each end of the newly-parallel resistors to one of those wires. Let the orange wire hang. Ensure a good solder job so there won’t be problems in the future. Wrap the whole thing in electrical tape and put the trim back on.
  8. Start the car again it works. Try again. It works again.
This is much better than having to try 6 times, waiting 4 minutes between each attempt, when I’m already late for work. I am thrilled to know that when I go to start my car tomorrow morning it will not be a 50/50 chance.



Posted on Sep 29, 2009

alicantecoli
  • 22246 Answers

SOURCE: my car wont start security light coming on just got new battery

dealer only

Posted on Jan 07, 2010

  • 15 Answers

SOURCE: i have a 2001 olds alero, the car wont start and

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

ZJLimited
  • 17970 Answers

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)

Hope helps.

Posted on Oct 25, 2010

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