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What is a pass key security system?

Updated: 10/23/2022
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16y ago

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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.

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