Question about 1997 Pontiac Grand Am

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Auto theft system keeps car from starting. Mechanic has replaced ignition system and computer chips. Three weeks and $700 later, the problem still exists. Any thoughts? I do not want to put any more money into this car but I cannot be without it, either...I need not only to commute back and forth to work, but for company errands and off site meetings.

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You said he replaced the ignition lock cylinder? What chips were replaced? Does your car have a remote starter?

Posted on Jul 21, 2010


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Can't be bypassed. Do a reset for the key. Ten minutes on thirty seconds off. A relearn is three times this. Try to start after. Once started, you need to have it scanned for security codes. To find out why it keeps loosing the programmed key.

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Glad to know this solution. The Format of Fixya sent me this cure as at some point I answered a problem of your make and model of car. It does not reference if I answered your problem or what I said as a solution. Chip problems may have been mentioned, and a new ignition switch may be a better solution if a Mechanic is receiving pay to work on someone else's car. Its fine for your own car repair. Thanks

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I believe that he tripped the BCM (body control module). If the BCM is faulty, you can expect electrical failures on your vehicle for the electrical circuitry runs through the BCM. You may need to have it replaced to resolve the electrical issues.
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Yes, this your anti theft security failing. Its having a hard time receiving the transponder signal from your key. When it doesnt get this signal, it turns off the starter to prevent theft. It basically thinks its getting stolen so it shuts down. The problem is in the diagnoses. It might be the key, the ignition/lock cylinder, or the TDM computer itself. (Theft Deterrent Module) All are expensive and pointless to fix. Your cheapest route is to bypass the whole system and never worry again. The average life on these systems is 6-10 years. Here is a link with info and some DO IT YOURSELF ways to beat this.

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Most cars have an ignition chip on their ignition key. This is an anti-theft feature. If it gets damaged or your ignition switch doesn't read it properly your car won't start. Everything else will work your engine just wont crank over. You can replace the ignition switch and key or you could bypass this theft feature. Talk to a mechanic to locate your ignition wire under the dash near the steering column. You can get a resistor (at Radio Shack) that matches the resistance of your key. Cut the ignition wire and put the resistor in its place to reconnect the cut wire. If you cut the right wire and the resistor matches your key you can trick your onboard computer to allow the car to start. This is what I did rather than replacing the switch. Cost of this fix less than $3.00 this way.

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Cadillac seville won't start

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I had a Ford F150 New at dealers, It did the same thing, come to find out the dealer had given me the wrong key, and the chip did not match the ignition system. Maybe your chip has malfunctioned.

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How can I bypass a anti auto theft system on my 1990 cadillac seville?

I Have A Seville 1990, When That Happen To Me I Got The Inginion
Replaced Problem Solved. What Is Happening Is Your Key Has A Chip And That Chip Is A Resister And When The Valve Is Not Sented To The Computer It Disengages the Fuel Pump And Than Tells You To Wait. Soon All That Will Happen Is You Will Get The Wait 3 Mins And It Will Never Start, A Good Locksmith Can Take Care Of This For You And That Will Save You Some Money. Cause If You Go To The Dealer Ouch They Will Hit You Up. But I Asure This Is How It Will Happen Cause It Is How It Happen To Me
And Sorry There Is No By Passing The Computer

Nov 02, 2008 | 1990 Cadillac SeVille

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