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Cadillac Technician
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The brass key in the package is a blank with the mechanical cut for the new keys with pellets.
You must take your OLD key to the dealership, and take the brass key with you. They will match the pellet in your old key to new key blanks and cut them the same cut as the new lock cylinder key blank.
Get 2, you don't want just one key for your car right?

Then all you have to do is replace the lock cylinder... if you have the speical tools and the know how.... and you are good to go.
You can't use your old keys anymore.
The new cylinder comes with the key blank because you can't change the tumblers in a PK2 lock cylinder, that blank is critical to it's operation with new pellet matched keys!

HTH

If you wanted to bypass the theft system, then you just wasted money buying the lock cylinder.
Don't bypass it.
 

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Cadillac Technician
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CAN you bypass it? Sure, I assume you mean temporarily?

Get an ohm meter, measure the resistance of the pellet.
Go to radio shack and buy a resistor of a close value, Find the VATS wires under the dash, they are two small white wires that come out of a thicker orange insulation, they run into the end of the large connector under the driver side dash. Leave some slack by cutting as close to the orange insulation as you can, strip the wires back and connect the resistor between the two wires, remember to do this on the connector side, the orange insulation will be left dangling until you can repair your lock cylinder.
 

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Cadillac Technician
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The problem is not the key, it's the wires in the column, you need to replace the lock cylinder.

I am getting dizzy....
 
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