If you have 2 orignal keys you can use this procedure
CUSTOMER LEARN PROGRAMMING
Obtain the additional Sentry Key transponder blank(s) that are to be programmed for the vehicle. Cut the additional Sentry Key transponder blanks to match the ignition lock cylinder mechanical key codes.
Insert one of the two valid Sentry Key transponders into the ignition switch and turn the ignition switch to the ON position.
After the ignition switch has been in the ON position for about three seconds, but no more than fifteen seconds, cycle the ignition switch back to the OFF position. Replace the first valid Sentry Key in the ignition lock cylinder with the second valid Sentry Key and turn the ignition switch back to the ON position. Both operations must be performed within 15 seconds.
In approximately ten seconds the VTSS indicator LED will start to flash to indicate that the system has entered the “Customer Learn” programming mode.
Within approximately sixty seconds of entering the “Customer Learn” programming mode, turn the ignition switch to the OFF position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the ON position.
In approximately ten seconds, the VTSS indicator LED will stop flashing and stay on solid for approximately three seconds and then turn OFF to indicate that the blank Sentry Key transponder has been successfully programmed. The SKIS will immediately return to normal system operation following exit from the “Customer Learn” programming mode.
Repeat this process for each additional Sentry Key transponder blank to be programmed.
If any of the above steps is not completed in the proper sequence, or within the allotted time, the SKIS will automatically exit the “Customer Learn” programming mode. The SKIS will also automatically exit the “Customer Learn” programming mode if it sees a non-blank Sentry Key transponder when it should see a blank, if it has already programmed eight valid Sentry Keys, or if the ignition switch is turned to the OFF position for more than about fifty seconds.
NOTE: While in Customer Learn mode (LED flashing), the engine will not START and RUN.