This is taken from the Jeep Compass owners manual. This is the instructions on programming an ignition (Sentry) key.
Replacement Keys
NOTE: Only keys that have been programmed to the vehicle electronics can be used to start the vehicle. Once a Sentry key has been programmed to a vehicle, it can not be programmed to any other vehicle.
At the time of purchase, the original owner is provided with a four digit PIN number. This number is required for dealer replacement of keys. Duplication of keys may be performed at an authorized dealer or by using the Customer Key Programming procedure (below). This procedure consists of programming a blank key to the vehicle electronics. A blank key is one which has never been programmed.
NOTE: When having the Sentry key Immobilizer System serviced, bring all vehicle keys with you to the dealer.
Sentry Key Programming Instructions
You can program new keys to the system if you have two valid sentry keys by performing the following procedure:
- Cut the additional Sentry Key Transponder blank(s) to match the ignition switch lock cylinder key code
- Insert the first valid key into the ignition switch and turn the ignition switch ON for at least 3 seconds but no longer than 15 seconds. Turn the ignition switch OFF and remove the first key.
- Insert the second valid key and turn the ignition switch ON within 15 seconds. After ten seconds a chime will sound and the Theft Alarm Light will begin to flash. Turn the ignition switch OFF and remove the second key.
- Insert a blank Sentry Key into the ignition switch and turn the ignition switch ON within 60 seconds. After 10 seconds a single chime will sound. The Theft Alarm Light will stop flashing, turn on for 3 seconds; then turn off. The new Sentry key has been programmed.
Repeat this procedure to program up to a total of 8 keys. If you do not have a programmed sentry key, contact your dealer for information.