Could someone explain, BASICALLY the electronics of how a "chipped" car key works?

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zanthus

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What are the basic electronics behind the chip in a car key?? Is the chip a resistor of some sort?? Like when the key turns, what happens??

I would like to have the basic infomation, so I can show my dad..He has an older car and has no friggin clue what I am talking about when I told him I need a an expensive programmed chipped key. If he understands what I am talking about, he can probably bypass it for me :)
 
transmitter sends a signal. can't be easily disabled. thats why they are used for anti-theft purposes. take the vin# and proof of ownership and go to the dealer and get another key, i know it's expensive but that's technology for you. old cars aren't always so bad eh?
 
The chip is an electronic device inserted into the key. It makes a connection on both ends when inserted ito the ignition. This connection tells the computer that the correct key is in the car. The chips vary in OHMS readings or electronic code so a duplicate key cut from original key will not work without the proper chip in it. Bypassing chip is difficult without the proper reading from original key, Be it electronic coded or Ohms type
 
It varies by manufacturer.

GM used to use one of fifteen resistors in their passkey system. If you inserted a key with improper resistance, the computer would disable the fuel injectors and the starter, and make you wait three minutes before you tried again.

I don't know if that's how it works now, or what other companies do.
 
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