GM used keyless entry system remote transmitters with an FCC ID of KOBLEAR1XT on many vehicles from 2001 through 2005. For instance, 2001, 2002, 2003 and 2004 Chevrolet Impalas, Monte Carlos and several other models had keyless entry remotes with FCC ID KOBLEAR1XT.
The keyfobs had a variety of button configurations depending on whether or not the remote operated a rear function and on what that function was. Also, some of the vehicles had seat memory systems, so some of the cases show a large number “1” or “2” on the back of the case.
The keyless entry systems used on most of these GM vehicles are user programmable. But a few vehicles that used this remote, including some Pontiac sedans, require dealership programming.