How to Program a 2003 Cadillac CTS Ignition Chip Key Transponder

Step by Step How to Programming Instructions:

These programming procedures are applicable only to vehicles built in the USA.

Can I program a new key myself if I have no working keys?
Yes, once you have the new key cut by a locksmith, follow these instructions:

1. Insert a new cut key into the ignition and turn the key to the ON position for 10 minutes and 30 seconds.
2. Within 45 seconds, turn the key to OFF and then back to the ON position for 10 minutes and 30 seconds.
3. Within 45 seconds, turn the key to OFF and then back to the ON position for 10 minutes and 30 seconds.
4. Turn the key OFF then back ON. The key is now programmed. Start the vehicle to test the key.

And for programming a duplicate key:

1. Insert an existing programmed working key into the ignition cylinder.
2. Turn the ignition to the ON position for 5 seconds, then back to the OFF position.
3. Remove the existing key and within 5 seconds insert the new key and turn it to the ON position for 5 seconds.
4. Turn the key OFF then back to ON. The key is now programmed. Start the vehicle to test the key.

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