Question about Cadillac DeVille

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I have a 2003 Cadillac Deville. A few days ago the security light came on and would not go off. It then told me to service theft system. It stopped at a light and would not restart. I took it to the mechanic and they said it was the battery. I ran fine for a day, then the speedometer started to go through all the number and the security system light came back on and it stalled and would not restart. When the tow truck got their it started right back up. Any ideas on what it could be.

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6ya6ya
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Posted on Jan 02, 2017

  • 512 Answers

SOURCE: 1995 Chrysler Concorde

the alarm is activating when he locks it and for some reason the key or fob isnt deactivating it..check the disarm switches in the door

Posted on Oct 01, 2008

  • 1 Answer

SOURCE: 02 Cadillac Escalade won't start

go to autozone and get free diagnostics if its egr valve its like 100 buycks and takes 5 minutes to replace i had this problem with mine cutting off while driving and not starting

Posted on Jan 08, 2009

honeymokey
  • 3113 Answers

SOURCE: replaced battery now car will not start, service security system message on dashboard info. please help

The car is not reading the key and thinks someone is trying to steal it. Try another key or see a dealer.

Posted on May 09, 2009

  • 6982 Answers

SOURCE: turn the key and nothing happens,no crank,no sound,no start

It seems that you have a loose wire, bad connector or perhaps the main computer itself that is causing a problem If the shop is not seeing any codes, or codes come and go, likely I'm right...but someone is going to have to actually do some intensive testing to find the real cause. You can likely get another computer from a local scrapyard far cheaper than what the dealer will charge you...as far as wiring, you need a good accurate schematic a good volt/ohmeter and lots of time to trace wiring. When checking connectors test the pin, then probe the wire going into the pin...often the problem is where a wire meets the backside of the pin, either corroding or breaking..This also applies to any modules such as the security system...what you see on the dash does not always tell you that connection to components is good. This is not a "fix, but rather, a direction to go in. (exactly what I"d need to do if I was there)
Right now, everything is suspect including fuel system, till you rule it out!!!

Posted on Jun 05, 2009

  • 2 Answers

SOURCE: 2006 Ford Truck (Diesel) Just Clicks, Won't Start

had the eact same thing happen on my diesel and it turned out to be the alternator which had fried oine of the batteries.... you could put a charge on them and it would run for a week or ten days and then nothing.. clean the cables charge it up and it would go again... finally it just stop taking the charge and I look deeper and replaced the batteries ran fine for two weeks then dead again... alternator finally finished itself off... problem had been a little intermittent till then.. good luck

Posted on Sep 25, 2009

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Dec 29, 2015 | Cadillac Cars & Trucks

2 Answers

98 Cadillac deville won't start,anti theft system has locked my car. What do I do to avoid spending more money?


Unless the vehicle has an after-market anti-theft system (in which case you will have to have it removed), the anti-theft system can be reset by placing the key in the driver door and turning it towards "unlock," then holding it there for 10 seconds or more.
If someone installed an after-market anti-theft system on the vehicle, you're pretty much on your own to disable it.

May 11, 2015 | 1998 Cadillac DeVille

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2003 Saturn Vue with a identity anti theft system. Replaced my battery a few months ago. Couple weeks ago noticed a little difficulty starting up. Last week wouldn't start just clicking noise. Jumped...


Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
Starter Voltage Drop
How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

May 17, 2017 | Cars & Trucks

1 Answer

I have a 2003 cadellac deville that will not start. There seems to be no power from the ignition out. I have checked the started and it is good. Someone changed the key ignition around 3 months. It only...


It could be the neutral safety switch which prevents you from cranking the engine in gear.
But it could also be the anti-theft system. The system reads the chip in the key to allow the starter to crank the engine.
Is the security light staying on ?

Jan 14, 2013 | 2003 Cadillac Deville

1 Answer

Can't get ignition starter switch to go on my 91 cadilac deville 870-688-8335


Do you see a light that says SECURITY on the dash somewhere? This can turn off your starter and disable your car. Read about it on this link with options on how to fix it yourself.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Cadillac Deville with anti theft security problems VATS system

Jul 08, 2011 | 1991 Cadillac DeVille

1 Answer

2002 Deville--I started my car with my key #1, drove a short distance. Took that key out and husband tried to start car with key #2. Security system warning came on and car will not start. Is there an easy...


SWITCH IGNITION ON WITH MASTER KEY TO BE PROGRAMMED.TURN ON IGNITION KEY TO ON POSITION.SYSTEM LED SECURITY LIGHT WILL ILLUMINATE.LEAVE IGNITION KEY ON POSITION FOR 10 MINUTES UNTIL SECURITY THEFT LIGHT DISAPPEAR.THEN SWITCH OFF IGNITION SWITCH WAIT 5 SECONDS, THEN START THE ENGINE,THIS WILL HELP YOU FOR A WHILE BUT YOU NEED TO GET THE THEFT SECURITY SYSTEM SCANNED CHECK OUT AT THE GARAGE OR DEALERSHIP.

Apr 04, 2011 | 2002 Cadillac Deville

2 Answers

Anti theft system came on dash. shut the car down will not start. 2002 cadillac. i was told 30 differ sensor showed wrong. which sensor to start with.


The SECURITY light is located on the instrument panel cluster.

If the ignition is off and any door is open, the SECURITY light will flash, reminding you to arm the system. To arm the system, do the following:
1. Open the door.
2. Lock the door using the power door lock switch with the door open or the remote keyless entry transmitter. The SECURITY light should come on and stay on.
3. Close all the doors. The SECURITY light should go off within approximately 30 seconds. If a door or a trunk is opened without a key or a remote keyless entry transmitter, the horn will sound and the lamps will flash for about 30 seconds.

Also can check this and other details in the 2002 Cadillac Owners Manual (page 85 and next).

Hope helps (remember rated and comment this).

Jun 15, 2010 | 2000 Cadillac DeVille

1 Answer

Security system for automobile


u can't just clip the wire however you can install a resistor that equals the value of the key into the anti-theft module to bypass it.

Oct 05, 2009 | 1994 Cadillac DeVille

1 Answer

1997 cadillac deville delagance - anti theft device


I've got a 97 deville d'elegance that has issues similar to these. Last year the red anti-theft light came on and the car wouldn't start-took it to the dealership and they replaced the PCM? (the main brain for the system) for $900...the guy told us the wiring was so corroded he didn't want to mess with it much. Today the message started flashing on the dash that says "anti-theft problem/ car may not restart" but it still turned over in the driveway a couple times so I am hoping I can reset it. The wiring system is jacked and will probably need to replace the wiring harness completely. Doubt its worth it. Not a secure feeling with 2 babies in the back seat in the middle of winter....

Mar 30, 2009 | 2001 Cadillac DeVille

1 Answer

I think its my starter or fuel pump, but not sure.


If your security light is on it may be your key that's preventing the car from starting. It's programmed with a code to prevent theft (Pass II theft deterrant system or something like that). So either the key is screwed up or the module that reads it is screwed up - either way it will disable your ignition.

Mar 25, 2009 | 1999 Cadillac DeVille

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