My car won't start . A message says starter disabled due to security .

Your doing it wrong !
30-Minute Relearn Procedure
Use this procedure after replacing the following components:
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The passkey III (PK3) keys

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The BCM

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The PCM, see important above

Important: This procedure is not available on vehicles equipped with option code (Z49).
If replacing a BCM with an GM SPO Replacement Part, perform the procedure to setup a new BCM prior to the 30-minute relearn procedure.

1. With a master passkey III key, turn ON the ignition, with the engine OFF.
2. Observe the STARTING DISABLED DUE TO THEFT message on the drivers information center (DIC), after approximately 10 minutes the STARTING DISABLED DUE TO THEFT message on the DIC will turn off.
3. Turn OFF the ignition, and wait 5 seconds.
4. Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes.
Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

5. With a master passkey III key, start the vehicle. The vehicle has now learned the key transponder information and the PCM has now learned the fuel continue password.
6. With a scan tool, clear any DTCs.

Not sure of the year of your Tahoe but I can tell you the standard procedure to program your key for say like a 1999. First make sure your battery has a full charge. Next if you have any security related trouble codes stored in your computer, you will need to clear the codes either by clearing them with a scanner or disconnecting the battery for at least 10 minutes to clear the codes. The first step is to turn the key and just let it turn over quick but not enough to where the vehicle starts and shuts down again. Just kind of tap the key as if starting it so the starter turns the engine for a second. When you do that just release the key so it stays in the "Run" position. Lights will be on in the instrument cluster including the security light. The security light may flash on and off. Leave the key in the run position for 10 minutes. After 10 minutes the security light usually goes out but not in all cases. After 10 minutes in the run position, turn the key to the off position but do not remove the key. Wait 10 seconds and do the first step again (Tap again let key stay in run position for 10 minutes). You will need to do this 3 times totally about 30 minutes. On the 3rd time when the 10 minutes is up, turn off key, do not remove the key and then start the vehicle. This procedure should work to progam your key. If it doesn\'t you may have another problem with the security system. Let me know how it turns out and I hope there isn\'t another problem and the computer just lost the transponder code. there is a security relay/module that sometimes goes bad in those Tahoes but try programming the keys first. If that doesn\'t work and you need further help as far as that relay/module & to let me know how it turned out,

Hello, RW Betton,

Here is a few things to try then please read toward the bottom. Please read my whole page here of ideas for you.

Question? when it does disable it usually will say " starting disabled due to theft system remove key from ignition and wait 3 minutes'. Are you able to start car after the 3 minutes? or it wont period? My car does this a lot to but I think its cause you have to unlock the car, get in it, shut the doors and then start the car because mine does it when i open the doors.

Also some times if you have a chip in your key will do this as they ware out, and would have to try you back up key (if you have one) and if turns out to be your key, that has bad chip, dealer would have to replace that.

Finally, this is your other choice as well below, and you can click on that site and it should help you. Most the times this whole issue is triggered from the key itself into the ignition, that cause this.

If you have the GM pass lock system in that car, this is a site that will show you how to disable it:
http://www.kingbain.com/how-to/how-to-p
ermanently-disable-gm-passlock-system.h
tml

However, if it were my car I would see what the dealer will charge to fix it first. It may just be a simple reprogramming is needed or a inched wire in the steering column. I would want the car to have an anti theft system working as it should.

I hope my free advice has helped you, and if you could please rate my help accordingly and some kind words too. I appreciate it, and keep me informed on progress. Here is also my direct link for all my services I offer to help you.

That is my personal page of all my areas of ads of my expertize. Mike

Try opening the door with the key. If this doesn't work, wait 15 minutes and try again

u will need to bypass the VATS factory security systemm the part u need to fix it is no longer avail from GM, it is easy, here are the full instructions, go to the link.
http://vats.likeabigdog.com/

As the prescribed method isn't working it would seem likely the antitheft system is broken and should be checked by a professional.

Electronics aren't bulletproof and at over 20 years old the ones fitted to your car are 20 years less robust and 20 years less sophisticated and easily damaged by such things as welding, battery charging, jump starting or even nearby lightning strikes. Such instances often do not cause obvious damage immediately but rather have a weakening effect so the final breakdown happens later, maybe years later.

check ALL the ground leads coming out of the battery,sounds like somethind is loose or not making a perfect connection,get back to me and we'll go through tracing the problem. remember lights do not need a pefect ground Thanks Ray please rate my fix

try this, remove the battery cables, leave off for 10-15mins,reconnect,negitive first then positive, if this doesn't do it,replace the P.C.M.you can find one on line cheap and they will program it to your car. hope this helps and good luck to u ..

the wire that goes to the ignition to the anti theft device is probably broken if you call a good locksmith they can go in through the steering column and fix it same thing happened to my 95 eldorado apparently cadillac designed the anti theft system to coincide with the ignition and is connected to the ignition with two wires that turn as the key is turned the wires twist and eventually they wear out

i have a 91, this happens to me but it says STARTER DISABLED on the display. If the 90 is the same, it is an anti theft feature. On the ignition key there is a black square thing after the teeth of the key. The system needs to recognize the black square to start the car, so if it is warn down you will have this problem. Get a spare made with that special key only some key copier places have it. But on mine if you wait 3 minutes after the message shows up, you can then start it successfully.

Good luck!