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I have a 92 Oldsmobile Toronado that was recently broken into and my igniton was broke. And now I can't start it. I can put the key in it and turn like usual but the information center is saying starting disabled. I have a computer chip in my key that connects to the sensor in the ignition. My question is, does anyone know how I can overide the security system and reset the computer to get my car started. If anyone can help me with this, it would be greatly appreciated.

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You'll have to replace the ignition cylinder (switch) and possibly the keys and the VATS module if they were damaged too. Since you didn't give much detail as to the extent of the damage, I am just speaking off the top of my head.

It's best that you bring the car to an ASE (Automotive Service Excellence) certified mechanic who is trained and equipped with VATS tools (vehicle Anti-Theft System).

VATS was implemented by GM on their vehicles.

[Side note: There still may be some locksmiths out there who may also be of some assistance and knowledgeable in this area- but not all are.]

The basic function on how the VATS works on your automobile:
The ignition key has a "chip" (a resistor) installed on it, which can be easily seen.

When you attempt to turn the ignition ON, the resistance of the chip is measured where it is compared to the value stored in the VATS decoder module.

If they are the same, a signal is sent to the Engine Control Module [ECM] telling it to fire the fuel injectors.

At the same time, the starter enable relay will be energized by the VATS decoder module.

If the wrong resistance is read, then the electrical signal is interrupted. When no signal is sent to the ECM, the starter enable relay will not be energized, and the injectors will not fire.

At the same time, a computer fault code will register in the ECM, preventing the electrical circuity to complete its path. Hence disabling the cars ability to start

The good news is, the fault code is not permanently stored in the ECM's memory. It's a temporary fault code that will clears itself up.
The module will shut down for 2 to 4 minutes. During this time, any attempts to start the vehicle will not work. If the ignition switch is turned during this time, the timer will restart even if a key with the correct resistance is used.

To "over ride" the system per se, you will need an ohm meter (or a multi-meter that has an Ohm selector scale ) - you can buy them at any electronics store like radio shack or hardware stores like home depot or lowe's.

Take a resistance reading (measured in ohms- if you are using a multi-meter, set the dial on the meter to read resistance that is symbolized by the capital Greek letter Omega. (if you need help in setting up your meter, written instructions come with it or you can see a video on youtube on how to measure resistance, voltages, etc)

Measure the resistor chip on the key;it should match any one of the following 15 possible resistance values that were used by GM:

402 ohms (acceptable range 386-438)
523 ohms (acceptable range 502-564)
681 ohms (acceptable range 650-728)
887 ohms (acceptable range 850-942)
1130 ohms (acceptable range 1085-1195)
1470 ohms (acceptable range 1411-1549)
1870 ohms (acceptable range 1795-1965)
2370 ohms (acceptable range 2275-2485)
3010 ohms (acceptable range 2890-3150)
3740 ohms (acceptable range 3590-3910)
4750 ohms (acceptable range 4560-4960)
6040 ohms (acceptable range 5798-6302)
7500 ohms (acceptable range 7200-7820)
9530 ohms (acceptable range 9149-9931)
11800 ohms (acceptable range 11328-12292)

Buy a resistor that closely matches the reading you took with the ohm meter. Hook up the resistor between the ignition wires on the cylinder where the key would normally male contact with.

Posted on Nov 24, 2013

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  • Expert
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I believe that your key has a resistor chip. You will need to find the resistance of your chip. Once found, go to an electronics store and buy a resistor with the same value. Follow the two wires that go from the ign switch down the steering column , into a 2 wire plug into the ign module. Unplug the connector. Plug the resistor to the module. The module will read this value and allow you to start the car.

Posted on Nov 24, 2013

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4 Suggested Answers

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Posted on Jan 02, 2017

  • 401 Answers

SOURCE: We need to reset the computer on a 2003 Oldsmobile Alero

HI there if the scan tool you are using will not reprogram the theft module the try the 10 min relearn

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON (vehicle will not start).
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. The vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK. Important: The vehicle learns the Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
  6. Start the engine. The vehicle has now learned the Passlock™ Sensor Data Code and/or password.
  7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles

Posted on May 03, 2009

  • 1 Answer

SOURCE: cadillac seville won't start

I've got an even cheaper and easier solution, instead of buying a new cylinder, find that plug and snip the orange wires going to the old cylinder.Then remove the resistor chip from the key and solder each of the the wires to each side. this will fool the car into thinking the correct resistor chip is in place, allowing you to use the original key or any copies with or without resistor chips. i just did this to my caddy and it roared to life! :)

Posted on May 20, 2010

  • 2 Answers

SOURCE: security system won't let me start engine... I put

The thing that sucks is you can't disable the alarm. I had this same issue. Here is the link, you have to replace the actual board behind the dashboard, I don't know the names, sry! But I do know, you can solder them as well, that's what we did and it fixed it! Good luck!! Seems like a ton of ppl have this issue and it ends up costing you an arm and leg! http://ingriddijkers.com/CaravanPics.html

Posted on Aug 14, 2010

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