jthorusen

Greetings to the Forum:

I recently purchased a used 2005 Suburban LT 1500. The vehicle came with only one key and key fob, the latter being a GM original marked with a "2" on the back.

I purchased an after-market key fob from the internet and proceeded to do the "programming" steps. The after-market key programmed just fine and works well. However, the vehicle will not respond to the original GM key fob. I had replaced the battery in the original GM key fob and it was working well until I tried to program the new after-market key fob. Since the procedure erases all previous recognition codes, I was not surprised that the GM fob no longer functioned. What was surprising is that the vehicle recognized the new fob but refused to recognized the GM original.

I took a look at both fobs with my spectrum analyzer and both fobs output a data burst at about 315 MHz after the lock and unlock buttons are held down for ten to fifteen seconds, as per instructions.

Has anyone ever run into a problem with re-recognizing an original GM fob? Does this require dealer programming for a 2005 Suburban LT? (If so, it is cheaper by far to buy a second after-market fob than to pay the local Chevy dealer's price for programming.)

Thanks for any input.

Regards,
Jim T.

tech2

repeat the programming again but program the factory fob first...see what happens.

jthorusen

Greetings to the Forum:

Thank You very much, Tech2. Your suggestion did the trick. Apparently, the rule of thumb when using a combination of GM and aftermarket fobs is: Program the GM fob first.

Thanks again,
Jim T.