This is how to program your Chevrolet Trailblazer 2002, 2003, 2004, 2005, 2006, 2007, 2008, or 2009 replacement remote keyless entry fob alarm by yourself at home without going to the dealer.
There is also a free programming tutorial video below to show you how easy it is done.
Obtain all remote transmitters.
Close all doors.
Insert key into ignition, do not turn ignition switch.
Press and hold door lock switch in the unlock position.
Switch ignition ON, OFF, ON, OFF.
Release door lock switch.
Doors will lock and unlock, indicating programming mode activated.
To program remote transmitter proceed as follows:
Simultaneously press and hold transmitter LOCK and UNLOCK buttons.
Doors will lock and unlock, indicating remote transmitter programmed.
Repeat above procedure for each remote transmitter.
Switch ignition ON to exit programming mode.
NOTE: Existing remote transmitter memory positions will be overwritten.
NOTE: A maximum of 4 remote transmitters can be programmed.
I am trying the procedure above for my 2002 Trailblazer, but just a couple seconds after the truck enters programming mode, it exits programming mode. It happens about the time that I am pressing the buttons on the remote. After testing, the remote is not programmed. Why would my truck be exiting programming mode so soon?
If you still aren’t having any luck, you can try rebooting the keyless system by doing an electrical reset on the vehicle.
To do this you would simply disconnect one of the car’s battery cables for about 15-20 minutes, reconnect and then try the programming again.
Sometimes this will solve any ‘bugs’ that may be keeping the remote from programming.