Question about 1999 Chevrolet Monte Carlo

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1999 Monte Carlo 3.1 theft deterrent

What determines the code on a GM key blank used on passkey ignition? Is it possible to get a wrong blank? The blank we received has lower resistance than our old key.Tried to relearn our system,and it didnt work..is there way to test the ignition switch itself?

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  • cvalen1727 Sep 12, 2009

    Key was purchased at a GM dealership..new key has a lower resistance,1.13 OHMS old key is much higher,11.74 OHMS

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If its the older VATS system with the pellet in the key, you must get the key with the exact resistance value. A GM dealer of any reputation should have what is called a VATS interrogator. It is inserted into the ignition switch and the VATS module is "interrogated" for the correct resistance value. The dealer can then cut the correct key for you with the correct pellet in it. Rare, but the VATS module could also be bad. If thats the case, a new VATS module installed will learn the resistance value of whatever the first key is thats placed in the ignition switch and turned on.

Posted on Sep 12, 2009

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I would get the correct key... most locksmiths carry the GM keys

Posted on Sep 12, 2009

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1 Answer

Where is the starter relay on a 1998 Monte Carlo located


It's not called a starter relay , it's theft deterrent relay and it's controlled by the theft deterrent module.
When the ignition switch is moved to the START position (and the theft deterrent module recognizes the key code), battery voltage is applied to starter solenoid (through the theft deterrent relay). Both solenoid windings are energized. The circuit through the pull-in winding is completed to ground through the starter motor. The windings work together magnetically to pull in and hold the plunger, which moves the shift lever. This action causes the starter drive assembly to rotate as it engages with the flywheel ring gear on the engine. At the same time, the plunger closes the solenoid switch contacts in the starter solenoid. Full battery voltage is applied directly to the starter motor, which cranks the engine.
Theft Deterrent Relay
Behind RH side of I/P, above I/P compartment

Jan 08, 2017 | 1998 Chevrolet Monte Carlo

1 Answer

How do I disable the kill switch or bypass/disable the security code on my 2000 monte carlo?


The security, antitheft or lock picture/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.
http://www.diy-gm-security.com/

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Mar 21, 2016 | 2000 Chevrolet Chevrolet Monte Carlo SS

3 Answers

My car wont start ,how do I reset the theft system on a 1999 monte carlo


Is the theft light on the dash lit ? If so turn the key onto the run position till the theft light goes out, about 10min. Turn key off for a few min. then start , hope that helps. If not have to have it checked for codes in the (BCM) body control module or the (PCM) powertrain control module !

Dec 21, 2014 | 1999 Chevrolet Monte Carlo

3 Answers

97 Monte Carlo security system


The theft deterrent module probably isn't energizing the theft deterrent relay . Most of the problems with this anti-theft system is that the contacts inside the ignition key lock cylinder wear out an can't read the resistor pellet on the key or the wires on the back of the key lock cylinder break . This all mean the key lock cylinder probably needs to be replaced .Or you can do a by pass !

GM VATS Key Resistor Key Security Bypass

Nov 03, 2017 | 1997 Chevrolet Monte Carlo

1 Answer

I have a 98 monte carlo 3.1 auto trans. when i turn the key to start, the security light flashes and it does nothing


Have it checked for DTC'S - diagnostic trouble code's . I suspect the problem is with the tdm module or the ignition switch ???? Assuming will only get you into trouble . If the PCM - engine computer does not see the right coded meassage from the TDM it won't turn on the fuel injectors or it will cut them off in two seconds . .
Buick Security Systems 1998 Chevy is the same .
Ignition Key With Wrong Resistor Pellet Code is Used To Start Engine
The theft deterrent module performs one of the two following actions when you attempt to start the vehicle with a wrong ignition key:
• There are 15 PASS-Key® II resistance ranges. The PASS-Key® II resistance may be one of the 14 valid but incorrect PASS-Key® II resistance ranges. The theft deterrent module will perform the following actions when you attempt to start the vehicle (if the condition is present during an engine start attempt or for 1 second any time after the engine has started):
• Turns on the SECURITY indicator
• Sends a password to the PCM through the fuel enable signal circuit
• The password disables fuel delivery to the engine.
• Disables the theft deterrent relay, which disables the starter circuit
• Disables sampling of the PASS-Key® II resistance for 3 minutes
• The 3 minute time period is called the shut-down period.
• Disconnecting the battery will not clear the timer sequence. The timer sequence will resume when battery power is restored.
• Inserting the proper key during the vehicle shut-down period will not start the engine. The engine will not start until the shut-down period has elapsed.
• After the shut-down period, the engine will start if the correct ignition key resistor pellet is used.
• The PASS-Key® II resistance may be correct and allow the engine to start. Later during the same ignition cycle, the PASS-Key® II resistance may be one of the 14 valid but incorrect resistance ranges. The theft deterrent module will perform the following actions:
• Enters the fail-enable mode
• Turns ON the SECURITY indicator
• Sends a password to the PCM through the fuel enable signal circuit when more attempts to start the engine occur
• The password allows the fuel enable circuit to deliver fuel to the engine.
• Enables the theft deterrent relay, which also enables the starter circuit.

Ignition Key With Correct Resistor Pellet Code is Used To Start Engine
The theft deterrent module performs the following actions when the correct ignition key is used in order to start the vehicle:
• Enables the theft deterrent relay. The theft deterrent relay enables the starter unit.
• Sends a password to the Powertrain Control Module (PCM) through the fuel enable signal circuit. As a result, the PCM allows fuel delivery to the engine.


By pass theft system .
GM VATS Key Resistor Key Security Bypass

Sep 06, 2017 | 1998 Chevrolet Monte Carlo

1 Answer

I have an 02 monte carlo security is coming on message center and car wont start


This is a very common problem on GM vehicles. GM's anti theft system relies on many things to be working "just right". If they are not, your vehicles goes into anti theft mode and locks out the starter and/or injectors. Leaving your car "immobilized". The hard part is finding which part of the system in failing. The KEY, the IGNITION/LOCK CYLINDER, or the actual TDM computer (Theft Deterrent Module). Any 1 one of these parts will be 100-700 bucks plus dealer fees and labor. I have had great luck in just bypassing the whole system. If you do this permanently, you'll never have to worry about this again, and you can do it yourself in about an hour. Check out this link for info, pictures, and DO IT YOURSELF ways to beat this problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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Jun 21, 2011 | 2002 Chevrolet Monte Carlo

2 Answers

Security light came on last night while i was driving now my monte carlo wont start all the lights come on it just wont start


The SECURITY light is a common problem on GM cars. The key is not just a key, it also communicates with the ignition/lock cylinder, and then to the TDM (theft deterrent module) also known as the computer. When these parts dont communcate properly, the car thinks its being stolen and turns off the starter. The hard part is finding out which part is failing. Mechanics can use this to their advantage and change everything, running up a large bill. I have found that bypassing the system is the most cost effective method and you also never have to worry about the problem EVER again. Ive bypassed dozens of GM vehicles, and never had any issues after that. Here is a link that explains the problem and offers some solutions.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Monte Carlos effected by Vats or Passlock security Failure that can be fixed by bypassing
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2005 Good luck, hope this helps. Any questions, please comment back.

May 27, 2011 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

How di I reset my security light on my 2003 monte carlo


PASSKEY LOCKOUT RESET ALL GM CARS 1999 AND UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key.

May 25, 2010 | 2003 Chevrolet Monte Carlo

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