The security light 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. These 3 parts are in CONSTANT communication. If the key is in the ignition, 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 goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
SOURCE: where is pcv valve 1998 buick lesabre
Remove the sight shield from the fuel rail. (it's the large plastic shield that dresses up the engine) As you stand in front of the car the alternator is located on rear left side. In front of it is an electrical connector to the MAP sensor. Remove it. Press the PCV valve cover down and rotate it 1/4 turn counterclockwise. It is actully on the intake manifold. Lift the cover, the upper O-ring and the spring from the housing. Remove the pcv valve and the lower O-ring from the intake manifold.
SOURCE: 1999 buick lesabre security light stays on car wont crank
you can bypass the security system entirely like I did. Once and for all. There is a great DIY write-up here http://newrockies.ca - it was the only thing that saved my Park Avenue.
SOURCE: WHEN THE SECURITY LIGHTS ON MY BUICK LESABRE 1992
Several GM products, including the Chevrolet Impala and Malibu, the Oldsmobile Alero, the Pontiac Grand Prix, and Saturn Ion, have issues with the Security light coming on. This is many times an indication of a failing Body Control Module (BCM). Initially, the Security light will come on then go off, progressing to a constant on light, before the car will refuse to start. Other symptoms may include erratic action of electronics, a clicking sound coming from the glove box, and the air conditioning failing to blow cold air. I recommend a shop that specializes in the electronic systems of vehicles to diagnosis and make the necessary repairs. They should keep the car until they replicate the symptoms described. A new BCM from GM should cost about $230; plan on another $200 for them to diagnose the problem, replace the unit, and program the new unit. The dealers quote between $700 and $1,100 for the same repair. My experience and the experiences I have read on the internet, indicate the new BCM should last only about a year.
SOURCE: 94 buick lesabre security light flashing
Ok..
Your vehicle is equipaded with Factory Anti Theft System.
Called Pass key II . If the mechanic found the Code
Pass key error....
Is there a few test to Do. to know exactly the problem.
1--- check if the Old and New key Are equipaded with a Little thing (Chip or Ressistence) in the center of the key.
If not you need a key with the chip. and the correct Ohms.
2. If you just replace the battery,
Full charge the battery Attemp to start the vehicle and leave the key in run position for exactly 11 Minutes, Them turn the key to off position for 30 seconds and try to start, if the vehicle start . you did the prosses to program the key.
If the vehicle not start.
Some times this procedure will require Up to 3 times to setup.
Or more with intervals of 30 minutes,, But if not start.
Remove the lower cover of the steering column. and the the Connector orange with 2 white wires shielded with a orange cover.
NOTE.. Be sure to not Confuse with the Yellow wires and connector, They are for the AIR BAG. Dont use a Convencinal Test light on any of the Mentionated wires....
After you find the wire and saw everything ok.
3-- You will need to remove the Ignition Lock cylinder.
The ignition lock cylinder is use 2 white wires shielded with orange cover, On 90% of the cases one of the wires come broken. and the ECM loss the comunication with the Chip incrusted in the key..
SOURCE: 1995 Buick LeSabre won't start when security light comes on.
When my 1994 LaSabre had a problem recognizing the chip in the key (due to the contacts in the lock not working), I managed to bypass the system by locating the two wires (clear tube with two smaller wires in it exiting the steerin column, unlike any other wiring), cutting the cable, and soldering a resistor across the two wires that go to the hidden module thet in turn controlls the starter and sends a signal to the engine computer. Use a resistor of the same resistamce value as in one of the keys for the car (measure resistors with a digital meter). There are a dozen or so values used. You loose the extra protection of the chip, but the fix is low cost.
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How i bypass the pass key code where is located
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