Anti-theft system reset?

Hey TEIGHLOR LOVE,

Please see the information attached as to relearn the passlock system.

Did you replace the electrical part of the ignition switch or the key and lock cylinder?

If following the instructions below you may need to attach a battery charger as the ignition has to be left on which may drain the battery during the process.

This guide can help as well

https://www.2carpros.com/articles/how-to-reset-a-security-system

Hope that helps

Regards, Joe

I replaced the key and lock cylinder that has the little black cord with one white cord coming out of it.

I thank you for your help by the way! I will try the thirty minute relearn process when I am off of work. And will respond with an update.

Also, I had someone tell me that i could disconnect my battery and touch the two terminals together. Wait a few seconds and reconnect the battery. Is this an effective approach?

Hey TEIGHLOR LOVE,

I have not tried the battery reset approach to resetting the PASSLOCK system.
A battery reset may work, you need to be careful not to short anything during the process.
The thirty minute relearn process is the safer way to go.

If you try the thirty minute relearn and it doesn't work i can run you through how to do a battery reset.

It looks like the part you replaced included the PASSLOCK sensor so the relearn should work to get rid of the light.

Let me know how it goes.

Regards, Joe

Still no luck, the light never went out during the entire process! :(

Fixed it! I put the new key tumblr in the old key cylinder and sensor. Light is gone now!

Hey Teighlor Love,

That'll do it!

Unfortunate that you couldn't get the new PASSLOCK sensor to code to the system.

It should have worked unless the sensor in the new part you had is not correct for the vehicle.

Glad you have it all sorted. Great work!

Regards, Joe

Thankyou for your time!! Much appreciated

Hey Teighlor Love,

No problem, thank you for using 2CarPros.

All the best, Joe

I replaced the engine with the same engine. It started right away. Ran fair. Shut it off, tightened exhaust and hooked up a wire and vacuum hose i had for gotten. went to start it. It turns over but will not start. I have a solid light in the instrument panel on the dash, that will not go out. I tried the 10 minutes in the on position, the off for a few seconds, I did this three times. The light never did go out at any time. How do I get this thing to reset ? The light says "Theft System".

When you tried the 10 minute trick, did you wait until the light went off? It could take a bit longer than ten minutes? Has anything been changed as far as the key, steering column, or anything other than the engine?

One other thought, do you have a spare key you could try, and which wire and hose was missed that you installed before this happened?

Joe

Try disconnecting the battery for about a minute and then see what it does when you reconnect it. If the light is still on solid there is a failure in the PASS system, to find it you will need a scan tool that can communicate with the power-train and security modules to see what the system sees as a problem. It's possible that the PASS lock system failed just as you were done or it could be a pinched wire or missed ground.

so there is no way around the PASS system other than taking it to a Chevrolet dealer?I do not have a good code reader.

Just the engine.

The system is part of the car, there is no way around it that will actually work. The engine swap wouldn't have triggered it. The system reads a signal from the key cylinder, compares it to the known good ones programmed into the power-train module through the body control module. A pinched wire or a short could cause it which is why I would start looking at the engine compartment for wiring issues first. The reason for the better scan tool would be that the PASS system can usually show if it's something like a short, a loss of signal, bad key.

Checked fuses. Fuel pump/injector fuse blown. Found wire pinched inside of harness to cylinder #2. Fixed wire. Engine starts. Turn it off and Theft System light, odometer stays lit, and engine symbol stays lit. Also under the hood, the fuel pump relay buzzes. Turn the key back to on and then off, the buzzing stops, but the lights, still stay lit. With the key off, there is a ticking sound, that sounds like it is coming from behind the instrument panel. Turn the key to the on position, without starting the car, and the ticking stops.

Also, starting the engine, shutting it off, then turning it back to the on position and then back off. Sometimes all the lights go off on the instrument panel, but the ticking behind the instrument panel continues until you turn the key back to the on spot. Could the short in the fuel system be back by the tank? Also, not to forget, When you take the negative cable off the battery, the theft system, locks itself. The small red light, not in the instrument panel will be flashing. The engine will not turn over. Cycle the door locks several times with the fob, push the option key on the fob, and the engine will turn over and start. Again, the lights and fuel pump relay do there bull crap. Any more ideas?

Could there be a short under the dash, that became a new problem with this car?

I would check a few more harnesses, It's possible that the wires got hot before the fuse blew. The symptoms sound like the PCM has an issue, so I would check it's wiring real close. The engine you put in was the same year, model and all correct? Just wondering if there is a harness fault from a wrong or shorted sensor that is sending power down a signal line or similar. That can cause multiple issues.

Hi, I replaced a stereo in my 2001 Chevy cavalier and after the car won't run over. The theft light comes on when the key is turned. Can you tell me if there is a reset procedure to get it working again? Thanks!

Hello

Here is a guide that will tell you how to reset the system

https://www.2carpros.com/articles/how-to-reset-a-security-system

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers

have a 99 chevy cavalier and it wont start! when i turn the key the only thing that comes on is the radio and the theft system light, this light does not blink it just stays on. i do not have a remote for this anti-theft system. how do i override this theft system to start my car?

GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it

My theft system light came on and when I try to start my car it stalls out on me and shuts down.

problem is most likely bad ignition cylinder and or switch. the temporary fix is to attempt to start the car then leabve the key on. after ten minutes the theft light will stop flashing and the car will then start.

My remote locks and unlocks the doors, but no head lights flash nothing ? Why?
Car listed above is a Z24.

Just to be clear, you are locking and unlocking the vehicle with the remote but you are wondering why the lights don't flash to alert you that the alarm is set or deactivated like other vehicles do?

If so that is because on earlier systems like this it was not an option.

I attached the info about the theft lock which is the anti theft system and the ignition system which means it has to have a key turn the ignition cylinder and not a screw driver or something else that could be used to steal the vehicle.

Let me know if you have other questions or I am not understanding. Thanks

Thanks!! But can I install a anti sym. In yet ???? Buy! A kit from. Amazon!?

Yes. Most any of those kits are made to fit any vehicle. Clearly you will want to make sure the company says it fits your vehicle but there are many options out there for alarm systems so I am sure you will find something that you are looking for. Let us know if you have questions on deciding on one and we can check it out. Thanks

I was working on the car and accidentally hit the the positive post on the battery. Now it won't start. How do you bypass the theft system?

You cannot bypass it. does the security light flash when you try to crank it over? If so lets try resetting the system. here is a guide:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down these guides and report back.

just replaced the starter in my car and now it wont start. Anti-Theft light on dash comes on, doesnt blink at all, just stays solid. how do i reset the pass code or reprogram it so it will start? Thank you for your time on this matter, anything will help!

ok, we need to relearn the system. Turn the key to start and back to on, let it sit until the security light goes out. then do the same thing again and let it sit until the light goes out, then do it a third time. when it is done the third time, it should have learned the pass code and should start. This guide can help.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Roy

Thank you for your reply, that worked. Thank you again for your time, Gina

The theft prevention system has been activated and the car will not start. The manual is not clear on how to reset the system. How do I reset the theft prevention system?

Hi Ed
you need a charged battery to perform the following.
is your antitheft light flashing or on steady ?

if flashing then
leave key on for 12 minutes minimum hopefully anti theft light is now on steady
do not disturb or 12 min starts again.
turn key off
attempt restart

some folks have reported up to 3 attempts at the above is nessacary to perform reset.

if keen do a search on passlock

I believe your cavalier is fitted with passlock 1 and not passlock 2

Regards

Don
New Zealand

my car only goes 10 miles per hr and the theft system light came on , i had to have it towed home whats up ?

Reset security system, procedure is in owners manual but generally:

GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position.
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it.

One morning my anti-theft in my car triggered because of my inexperience in mechanics or inner workings of a vehicle the key cylinder tumblers were not working properly to be able to turn or crank the car over with my key, it would not budge at all. I then foolishly removed the key cylinder in a frantic attempt to be able to get to work on time the anti-theft then trigger the car are though able to start and crank over but yet shut off in minutes of it starting up. I tried getting a new key cylinder with key and pass-lock and try to have the computer in the car relearn the new past lock and key but in many failed attempts was not able to do so. the car still starts it up and then shuts off. I figured that I would attempt to call somebody and I told them of the situation at hand of what I was going through and what I have done and what was the results from those things that I did and they told me well the problem was you need to have your body control module or engine control unit flashed to be able to learn a new pass-lock and key. then and only then will the car start and crank over and run properly after delivery learning process. I have two questions: 1.) Is this true about the flashing?
2.) if question one is true then what is the location of this unit or module that is needed to flashed? Thanks