Question about 1994 Buick Roadmaster

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How do i bypass the tdm in order for my car to start. or what is needed to be done to rectify the problem. is there aplace to get another ive tried everywhere. please help.

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What is the TDM?Let me know and I'll see what I can do for you.Security device?Greg
Sounds transmission related.

Posted on Nov 08, 2010


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Okay two weeks ago I was inquiring about a 1996 pontiac grand-am, this car is in overall excellent condition from the ground up. It still is faulty in the anti-theft module or circuit though, when i

Resetting is a temporary fix to a larger problem. A 96 grand am runs the Vats system. These systems do not relearn the key or ignition. They use that "chip" in the key shaft. So the fact that the "reset" temporarily fixes the problem leads to one thing. A failed theft deterrent module. (TDM) In order to fix this problem, you will need to replace the TDM or bypass the system entirely. I would lean toward bypassing the system. That way you never need to worry about it again, can be done yourself, and for cheaper than a TDM. Go to this link and look under PERMANENT FIX.

Nov 21, 2011 | Cars & Trucks

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Hello I have a 1994 buick park avenue. My security light is flashing and my car will not start. I have been back and forth to the dealership to get this alarm system disabled but I've been told that...

There are a few ways that i know of to BYPASS this system. This problem has been occurring on GM vehicles since 1982. They are fully aware of the problem and hundreds of vehicles are effected by this same curse. Since your security light is flashing, this tends to lead toward either a worn out key or a bad ignition. This system is all about READING the ohms of the chip in your key. The ignition reads this code, sends it to the Theft Deterrent Module (TDM), and then the TDM sends a signal that allows the starter to start. It is BREAKS in this communication that triggers the security light and the "no start" situation. If the security light were to be solid instaed of flashing. then this would indicate a failure in the TDM. Go this link. It explains the situation and offers 2 ways to bypass this system. The first one is considered a key/ignition bypass. This should work for you though it would still leave the TDM active. The second one is a full bypass which eliminates the entire system 100%.

Sep 05, 2011 | 1992 Buick Park Avenue

1 Answer

Can the security system on colorado 2006 truck be by passed

Yes it can, but it's not as easy as just snipping a wire or unplugging something. If it was, any criminal could bypass it and steal your vehicle. If you want to bypass the system, you must replicate the signal from your TDM (Theft Deterrent Module) which then eliminate all aspects of the system. There is a place that makes a product that will do this. Go to this link, it explains the system with pictures and links to sites to help you get this bypass done. The one you will need is under PERMANENT FIX. Ive installed dozens of these personally and they work to perfection.

Aug 14, 2011 | Chevrolet Colorado Cars & Trucks

1 Answer

I have a 1997 Buick Lasabre and would like to bypass the security system. What products can be used to fix this problem? Where can I obtain this/ these product(s)? And what would the approximate cost be?

The security systems on GM vehicles are notorious for breaking, failing, and leaving you stranded. There are 2 ways that i have found over the years to bypass these systems. I worked in a Auto Extras shop for over 5 years. We had to bypass these all the time for remote starts, eventually people came to me just for the bypass when their car's security started acting up. I have stumbled across an "OK" link about this system. It gives a pretty good breakdown of the system and happens to link to both the processes that i have used. So i just use it to help people. So i will give you this link now.

1) This bypass only works if you have a key with a visible "CHIP" in the shaft. Looks like a little black pellet with a silver line in it. Im pretty sure you have this type of key. You MIGHT be able to fix your problem for under 5 bucks and a little "know how". This can be found under TEMPORARY FIX on that link. It says on the link that its only for certain vehicles, but if you have that "CHIP", it'll work for you too. Ive performed this bypass on hundreds of vehicles and works well. Its only downfall is that it only bypasses the key and ignition portion of the security system. The computer part (Known as a theft deterrent module, or TDM) is still active and could possibly fail at any time. Most security issues can be found in the key or ignition, so its worth a shot.

The other one on the link is under PERMANENT FIX. This one costs money and has pros and cons. Ive installed dozens of these things. maybe even 100. They work great, but cost about 200 bucks. The downfall is that they cost alot more than doing the other bypass and the install can be challenging. The pros are that if you have a complete failed system that a TEMPORARY FIX could not fix due to a failed TDM, this will fix it right up for hundreds less than a buying a new TDM and having the dealer reprogram everything. This is also good for alot of newer vehicles who dont have that chipped key to do the other bypass with. Any questions, please comment back. I know these systems pretty well.

Heres another one. If your security light is flashing, the problem is in the ignition or key. If it's solid, it in the TDM. Might help you decide what you want to do.

Aug 09, 2011 | 1997 Buick LeSabre

1 Answer

I have a pontiac sunfire out of the blue my theft system light came on and now it wont start. why would this happen and how do i get it to disarm?

The anti theft system can fail for a number of reasons. Sometimes it can be as simple as the chip on the key starting to get worn out, or as large as the TDM (Theft Deterrent Module) computer failing. This can be as simple as a 100 dollar key or a 700 dollar TDM. Or any part in between. The hard part is diagnosing which part is failing. These early year's security systems dont run on the car's scanner, so getting scanned wont help. I have had great luck with just bypassing the system. This link has 2 ways to bypass this system. Ive used these bypasses DOZENS of times and both ways work depending the vehicle and which part is failing. Comment back if you need any more help. I know these old VATS SECURITY systems very well. You can contact the guy on this link too. He knows his stuff.

Jul 25, 2011 | 1995 Pontiac Sunfire

2 Answers

Car wont start now anti theft system lite is on and battery is draining help!!!

This is a VERY common thing that happens on GM vehicles. This is how it works. There is a Chip on your key shaft. This Chip sends a signal that is read by the ignition/lock cylinder. The ignition then sends this signal down the line to the TDM (Theft Deterrent Module). The TDM then allows the starter to start. Seems like alot just to start your car, (it is) but this is how GM decided to do it. The point being that without everything communicating that signal, nobody will be able to "hotwire" and steal your car. The bad news is that every part of that system is expensive and is a "dealer" kind of fix. Get ready to pay up to a thousand bucks to FIX it. The good news is that if you want to BYPASS it, you can do this a lot cheaper. Check out this link for info, pictures, and some sites to help you in this matter. Ive been doing these bypasses for years and done dozens of them, and if you bypass it permanantly, you will never have this problem again. You CAN fix this yourself. And will be alot cheaper than taking it in. You can contact me thru that link if you need any further help or have questions. Reply

Jun 06, 2011 | 1996 Chevrolet Cavalier

1 Answer

My car is not responding to remote key not starting when i try to start

Sometimes the original anti theft system put in by GM can cause a no start situation. The key needs to communicate with the ignition and then the ignition communicates with the TDM computer. (Theft Deterrent Module) The TDM then allows the car to start. When installing remote starts they tend to "bypass" the key ignition part of the security system. This will then eventually ruin the TDM. If you see a light on the dash that says SECURITY, then this is 100% your problem.
This link has info and some ways to fix this problem.

May 30, 2011 | Pontiac Bonneville Cars & Trucks

1 Answer

1997 oldsmobile 88 won't start the security light

Im guessing you tried to bypass the key in the ignition/steering column. This is ok unless the actual problem was in the TDM (theft deterrent module) In this case, the 2 wire bypass does nothing. There is another way to bypass this. Check out this link for tons of info and some DO IT YOURSELF options. Ive done several key bypasses and tons of full bypasses. They both work well, it just depends on what part is failing. I think you need the full bypass to eliminate that TDM.
1994-1999 Eighty-Eight

May 16, 2011 | 1997 Oldsmobile 88

1 Answer

Car will not start, security light flashing....

This is a common problem on GM vehicles since the mid 80's. The problem occurs when the key, ignition, and TDM computer are not communicating well together. Not only does the ignition need the key to turn, but also has to read that chip in your key to turn the starter on.The problem can be a bad key, or a worn out ignition, And in the worst case, the TDM. Common practice these days is to just bypass these systems. Ive found a site that explains it perfectly and gives 2 options to bypass. Id suggest bypassing due to the abundance of failures on these systems. I wouldnt spend 350-1000 dollars at a dealer just to have it break down again. The average life on these systems is 6-10 years...

May 06, 2011 | 1992 Pontiac Bonneville

1 Answer

I installed a pljx vats (keyless entry) bypass to remote start. When I try to remote start the system turns on but does not crank, (security light starts blinking) its when I insert the key that the remote...

For some reasons the bypass is not working, so you need the key to be recognized by the Theft Deterrent Module (TDM) before the fuel enable signal to the PCM can be activated.
There is a great DIY way of bypassing the VATS system entirely, including the TDM (that goes faulty very often with the age of the car). You can find the write-up here:

Jan 01, 2010 | 1998 Chevrolet Monte Carlo

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