the simplest way is to turn the ignition key to the run position. do not start the vehicle.
then, at the same time, press the lock and unlock for 15 seconds. turn the ignition off and remove the key. your keyfob should be functional at this point.
use the same process after installing a new battery in the keyfob.
Check the users manual
see your Chevy parts man.
Keyless entry was an option for the 2005 Chevrolet trailblazer model year. Most 2005 Chevrolet trailblazers came with the keyless option.
If there is a touch pad on the drivers door then it has keyless entry.
I am pretty positive that only a Chevy dealer can program the remote keyless entry device for you.
To program a remote keyless entry on 1996 Chevrolet pickup, first hold down the power unlock button of the door panel. Second, turn ignition key ON, OFF, ON, OFF. Then release power unlock button on the door panel.
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Keyless entry remotes must be programmed by a Hyundai dealer.
To program the 2004 Concorde spare keyless entry, you can take the vehicle to the dealer or you can download the manual. In the manual, there are steps to reset the keyless entry using your vehicle's VIN and other identifications.