How to fix it??

Asked by Aug 15, 2019 at 05:37 PM about the 1991 Buick Park Avenue

Question type: General

My security light just came on an it wont start at all??

2 Answers


A damaged key is often times the problem. This could also be a intention switch issue. Look up PATS/VATS system bypasses for your car.

1 people found this helpful.

You have the GM VATS security system. The most likely culprit is the ignition lock cylinder. There's two tiny wires that contact the pellet on the ignition key. They tend to break. When that happens the computer can't see that the correct key is being used so it shuts down the vehicle. When you replace the lock cylinder you must get the correct resistance value ignition key. There were 15 possibilities. The lock cylinder will come with a template for cutting the correct resistance value keys but the template will not start the engine. When you know the resistance value of the pellet on your ignition key use the chart below to get the correct number ignition key blanks. Have those key blanks cut using the template that came with the new lock cylinder. Hope that helps! Jim

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