Question about 1987 Cadillac Seville

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87 seville wont start everything is powered, doesnt have factory key, just had one made and the security or theft light keeps comin on everything gos off when you turn the key, no sound from the starter and cant get the trouble codes from the car. starter?

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Your car is equipped with the VATS security system. Cars with this system need a key with a "chip" in it to start the car. A regular key won't start the car because of the security system. A key from the dealership is needed to start any GM car with the VATS system.

Posted on Sep 23, 2009

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You are seeing the beginning signs of a failing antitheft system. There are 3 parts to this system. The smart key, the ignition lock cylinder that reads the smart key, and the Theft Deterrent Module. (TDM) If any of these three parts are failing, you get a "no start" situation. Go to this link for a breakdown of the problem, and solutions to fix it.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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When i open car door security lite flashes, car turns over but wont start


Your passkey security system is activated. The key has a transponder chip in it, if the ignition doesnt read that signal correctly, your anti theft will kick in to stop a potential car theif. Try turning the key forward like you are trying to start it. 2 clicks forward, for 10 minutes. Then turn it back and forward again and try to start. This may reset your system. If not, Its probably DEALERSHIP time.

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I have a 1999 chevy silverado and i had to change the battery today however the truck still wont start. The alarm keeps going off and nothing will turn the alarm off. I cant use my keyless entry remote...


did it start before you changed the battery?when you say the alarm goes off do you mean the factory alarm or did you have it installed aftermarket? is there a theft or security light flashing inside?let me know maybe i can help

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2 Answers

The car wont start, the brake pedal is locked like the anti-theft is active, the anti theft light is flashing when the keys are in the ignition. when i try to turn it on it doesnt turn over, just makes...


TRY REPROGRAM KEY .PUT KEY IN IGNITION SWITCH TURN IGNITION SWITCH ON POSITION 20 SECONDS DONT START ENGINE WAIT 20 SECONDS TURN OFF SWITCH THEN TURN SWITCH BACK ON 20 SECONDS WATCH THE THEFT SECURITY LIGHT BLINKING.WHEN THEFT STOP BLINKING VECHICLE WILL CRANK.IF LIGHT STILL BLINKING.TRY FEW MORE TIMES KEY IN SWITCH ON POSITION FOR 20 SECONDS.MAKE SURE YOU HAVE THE CORRECT CAR KEYS IN SWITCH IF NOT WRONG SET OF CAR KEYS WILL SET OFF THEFT SECURITY SYSTEM.IF KEY RESETTING TRICK DONT WORK.CHECK BATTERY POWER MAKE SURE YOUR BATTERY HAS 12.5 VOLTS AND CHECK SECURITY THEFT FUSE.IF ALL LOOKS GOOD YOUR SECURITY HAS TO BE CHECKED OUT AT THE DEALERSHIP.

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The security light being on is why your vehicle will not start.You need to get the codes to find out what is causing the problem.What you can do is when you try to start it and let go of the key but leave it to the run position the security light will come on and stay on for ten minutes.When it goes off turn the key off and then try to start it.The theft module relearns the key and it should start.Then you can take it to a repair shop and get it fixed.You can call ahead and make sure there is a shop that can diagnose and repair this problem.Hope this helps.Good luck.

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1 Answer

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Try cleaning your key off... those keys have security chips and if you get the oily or dirt on them your car wont start. Or try using a spare key if you have one... Good Luck!

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if the security light is on leave the key in the ignition in the run position for ten minutes untill the light gose off or starts flashing make sure its the factory key or else it wont work

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1 Answer

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have you disconnected the battery lately, or lost charge?  If so, dealer may need to reset the car.

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