2002 trailblazer keyless entry unable to reprogram fobs

yes if it is the same style fob but if the fob is remote start need a dealer to assist in the reprogramming
Free Keyless Remote Fob Entry programming instructions procedures for all...

just reprogram the 98 fobs to the 97 easier instead of ripping out the electrical system can reprogram lock /unlock if have auto start will need dealer to flash the fob
http://freeremoteinstructions.com/ Free Keyless Remote Fob Entry programming instructions procedures for all...

Here's a link telling you how to program your Fob. Key Fob Remote Programming Instructions 2002 Isuzu Rodeo Key Fob Remote...

Refer to You Tube ?

The security system on Toyota products are added by the distributor in your region. Many of those security systems will not allow more than 4 key fobs to be programmed into them. Have you owned this vehicle since it was new? Have you tried to program more that 4 key fobs into it? Have you tried programming it more than 2 times? If you security system has had more than 4 key fobs programmed in then the only way to get it to reprogram is the replace the security unit with a new one. I found this out the hard way and had to replace mine in my 2000 tundra.

Depending on the specification of your vehicle, the FOB generally serves one (or both) of the following functions:

1) Communicate with the vehicle's Keyless Entry system (operates central locking).
2) When inserted into the ignition, the transponder within the key will communicate with the vehicle's Body computer (BEM) to validate entry, before disengaging the immobilizer - allowing the vehicle to start.

When the key fob fails, you may lose functionality of the above systems.

Keyless entry failure - usually due to flat battery in the fob. Reprogramming of keyless entry can be done without dealership assistance.

Transponder/Immobilizer failure - this requires the key fob to be re-programmed by your local dealership.


Hope this helps....

Here's a link to program your fobs,need to do both at the same time. 2008 Subaru Forester Key Fob Remote Programming Instructions

The only way to program them is with a scan tool so you'll need to visit your local dealer to have it done. Here is how it is done.

1. Install a scan tool.
2. Use the scan tool in order to access programming: Vehicle Control System/Computer Integrating System/Module Setup/BCM/Program Key Fobs.
3. Press the START soft key on the scan tool. Important: The scan tool must stay connected until all of the transmitters are programmed.
   
4. Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of 5-10 seconds, the scan tool will indicate that the transmitter is programmed.
5. Repeat the previous step in order to program up to 4 transmitters.
6. Remove the scan tool.
7. Operate the transmitter functions in order to verify correct system operation.

GM FOBS cannot be reprogrammed at home...Dealer ($90-125) or go to a local car stereo shop and get their new keyless entry installed ($89)
Good Luck

need to remove door panel either the linkage clip either broke or disconnected --if have remote start on fob need dealer to program--if normal try these links
Lexus Free Keyless Remote Fob Entry programming instructions Free Keyless Remote Fob Entry programming instructions procedures for all...