The chip in your key is a resistor (there are several values). Your car's 'puter will only accept your original key's resister value. Go to your chev dealer. They can decide the chip you need ( from your original key) and cut a key to match the lock ( from the key to the switch you installed from your sister's car). These are not cheap keys, btw. Mike
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Wednesday, January 16th, 2008 AT 9:04 PM