I have a 2000 Tahoe & there's No chip on the Actual Key. To program the key Fob:
Collect All remotes that you wish to program. This procedure will erase all previously programmed remotes. You must program all existing and new remotes that you wish to use on the vehicle at this time.
Close all doors, insert key into ignition do not turn it.
Hold the Unlock button on the driver's door DO NOT RELEASE.
Quickly turn ignition ON OFF, ON OFF. Do not start the car turn the key to the ON position on the cylinder
Release Unlock button. Locks will cycle from lock to unlock Signally entering of programming mode. If the locks cycle before you release the unlock button the programming will not work. Repeat from step one.
Press and hold the Lock and Unlock button on the remote being programmed until the locks cycle again. This signals your vehicle has been successfully programmed. Repeat this step for any additional remote.
Turn key to the on position to exit from programming mode.