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Need to bypass security syestem on 95 olds cierra car wont stay running after changing ignition

Lost original keys replaced ignition and now car wont stay runnig need to bypass security

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The security 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.

Posted on Mar 31, 2014


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11 Answers

Changed ignition switch now security light stays on and truck starts and kills

You need to relearn the passlock system (security). There are 2 ways. One is with a scanner, which most diy'er wont own an expensive one to do it this way, here is the manual way. Start the truck and let it run until it dies. The security light should then be flashing. Leave the key in the run position until the security light stops flashing (about 10-15mins). After the light stops flashing turn the key off. Try to start the truck again. It should do the same thing (run for a few seconds and then die with the security light flashing). Again wait for 10-15 mins for the light to stop flashing and then turn the key off and repeat the process one last time. That's a total of 3 times. Once you finish the process the 3rd time. Let the truck sit for a minute with the key off. It should now be programmed and start and run normally.

Jun 02, 2014 | 1999 Chevrolet Silverado 1500

2 Answers

I lost the origninal keys and put in new ignition and now my car wont stay running how do i bypass security system

I think this job is too tedious to do here, so I suggest you call an oldsmobile dealership and ask to speak with a mechanic. Customer service can direct you to where you need to go. Sorry,

Mar 30, 2014 | Oldsmobile Cutlass Ciera Cars & Trucks

1 Answer

Security system passlock

1st, did you use your original keys from your old column? If not the keys may be chipped in which case your truck wont start because of security system, MAKE SURE YOU USE YOUR KEYS IN THE NEW COLUMN..

2nd, if you did use your keys (Ignition switch) in your new column, then you may need to do a relearn on your system;

Attempt to start, when it fails, leave the key in the run position for 11-12 minutes (til the security light goes off).

Turn off for 30-45 seconds.

Repeat first step.

On the 4th attempt of this process, it should fire up.

Sep 20, 2017 | Cars & Trucks

1 Answer

My 2003 Tahoe runs great, but the security light on the instrument panel stays lit when the truck is running. It does shut off when the key is off and doors are locked. What's the problem??

The security light is an indicator for a failed antitheft system. This is ALL it is for. NOTHING else. If the light is on and you are experiencing no adverse effects, you are probably alright. My guess is that the system failed, and somebody bypassed the antitheft system. (poorly) This would cause the light to be constant and the vehicle to run normally. (assuming you bought this used)

Here is a cheap way to see if the system was bypassed.
Go get a copy made of your truck key. Will cost a couple bucks. The original key has a Transponder hidden in the plastic head of the key. This transponder is a needed part of the antitheft system. The new key will NOT have this transponder. If it turns fine and starts the truck like normal, then your truck is bypassed and problem is explained and solved. If the new key turns but the truck will not remain running, then you are probably on the verge of a security failure, indicated by the security light.

Also make sure the original key is nowhere near the vehicle when you try this out. You dont want the ignition reading the signal from the original key while trialing the newly copied key

This link explains the SECURITY issue more.

Nov 08, 2011 | 2003 Chevrolet Tahoe

2 Answers

I lost my original key with the chip so i change the ignition and the key i got now dont have a chip. know my car wont start and the security light flashes and the brake light all on the dashboard.

By trying to use another key yu triggered the antitheft system which prevents the car from starting. The only solution is to take it to a dealership and have them replace the ignition switch, the key and the module. About $1000.00. Or you can get a bypass system for about half that, maybe less. Check out this website before you do anything.

Jan 07, 2011 | 1995 Oldsmobile Cutlass Supreme

2 Answers

The steeing column in my 95 Olds Cutlass

does the key have a computer chip built into it. i think it does . if this is the case that,s your problem. the key has to match the computer in the car it,s programed from the factory like this. you either have to use the original ignition lock and key or get the lock in your new column keyed to your original key by a lock smith. than your car will start. good luck.

Apr 18, 2009 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Bypass security system on a 1988 Sedan seville

If you have the chip in the key, this is the method I used for bypassing the entire security system and never heard about it anymore:

Jan 27, 2009 | 1988 Cadillac Sedan DeVille

2 Answers

Security system will not let my car run.....

built into the pcm.....replace the key lock cylinder....get a new key with the same code as your old one and cut it to the gold key you get with the key lock cylinder

Nov 18, 2008 | 1995 Pontiac Bonneville

2 Answers

Replaced ignition and steering wheel now car wont start -security light on

first of all was the ignition dealer a lot of cars have a start chip built into the key if you did after market it may not be compatible with out bypassing key security chip with out the right key setup the car stays diabled

Sep 11, 2008 | 1994 Buick LeSabre

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