2) When the auto learn timer expires (the SECURITY indicator turns off) turn the ignition switch to OFF and remove the key.
3) Wait 10 seconds.
4) Repeat steps 1-3 two more times (for a total of thirty minutes).
5) Insert the newly learned key into the ignition lock cylinder and turn the ignition switch to the RUN position. The SECURITY indicator remains off indicating the new ignition key was learned,then start the vehicle.
---------------------------
But if this procedure is not helping, then it can be problem with the ignition lock cylinder.
You may have a fault with the security system in your vehicle with one of the components most commonly the cylinder that reads the key.In some cases the computer can just lose its memory on the key and the key can be re learned in order for the vehicle to start again.
Follow the procedure mentioned above to see if it will re learn the key and start again.If it does then you should be good to go from here.
If it does not then the security system will have to be tested to locate the failed component and then that component replaced to correct this condition here.-----------------
Does your cars ignition key have a small black chip in it? If so you may have an ignition lock cylinder problem. The lock cylinder has a couple of small wires that move with the cylinder when it is rotated, over time these can break (sometimes they break inside the wire insulation and are hard to diagnose). If you have an ohm meter its not too hard to check. Pull the lower panel under the drivers side of the dash and you will find a fairly large electrical connector with a screw in the middle holding the two halfs together. Remove the screw (7mm 1/4 drive socket) and seperate the two halfs. Find the bright orange coated wire that splits into two thin white wires and goes into the loose half of the connector. Have someone hold the key for you and put one lead of the ohm meter on each side of the key being sure that you are not touching the metal parts of the leads or the chip in the key. Get the resistance (ohms) reading. Then put the key fully into the ignition lock cylinder. Next put one lead of the meter on each of the two small white wires (they will be next to each other) you should read close to what you read from the key. If you do read the same or very close to the key, rotate the lock cylinder from off to run and then to crank. The reading should stay close to the key reading. If it goes out of limits (open circuit) you have a bad lock cylinder and it will need to be replaced.
What is a pass key security system?
The Pass-Key, Pass-Key II, or VATS, as it's called in earlier GM vehicles, uses a resistor mounted in the key blank to confirm that the correct ignition key is being used to start the engine. Many people call the resistor pellet a "chip" due to the common misconception that it is some sophisticated digital circuit to identify the key to the car. Not quite. It is not a "chip" of silicon as is customarily used for integrated circuits, but merely a block of carbon appropriately sized to have a desired electrical resistance.-----------------
-------------------
The PASS -key module controls the output to the starter enable circuit and the fuel enable circuit. If the module does not send the proper signal to the PCM , the PCM does not allow fuel to be provided to the engine. If the wrong key resistance is sensed the module will not enable the starter circuit. The security light on the dash will tell you where the malfunction is. If the light flashes or stays on all the time, the most likely problem is broken wires at the ignition lock.
When the alarm beeps the car will not start after that, this is because
the key has a pelet on it that has a code. When the computer reads the wrong code, it dosent let the starter move and dosent let fuel through the motor
--------------
--------------
So try re-learning the key, but if that is not helping, then you will have to take the car to local Buick dealer and they will reprogram the key and ignition cylinder chip.If the ignition cylinder chip is got malfunctioned, then it will be replaced.And this will solve the problem.----------
