I may not be right but try holding down your lock button until the doors lock?
No
To reprogram the key fob for a 2002 Mercedes, first, ensure you have all the keys you want to program. Insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" button on the key fob for about 5 seconds, then release it. Turn the ignition off and remove the key; the fob should now be reprogrammed. If you have multiple fobs, repeat the process for each one.
what answer!
After some extensive research on ls1gto.com and a few other sources, you cannot reprogram a 2004-2006 GTO Key. You must purchase a new fob, you can get them from Gene @ GMPartsHouse.com for a cheaper price. There are people who claim fobs can be reprogrammed, but I have never seen it documented or proven or a process of how to. I also own the factory service manuals (size of two phone books) and it states the FOB must be replaced. Good luck! Once you get your new FOB, there is a procedure you can find on ls1gto.com if you search for it.
With the dealers scan tool.
You'll probably need to have this done at a dealership.
your key fob can only be programed by the local gm dealer.
the bastards at the dealership have to do it...had it done, not cheap.
Take it to your dealership they would be the one to help you with that.
See www.isuzufaq.com entry 41. "How do I reprogram my keyless entry fob?" The first procedure (turn key 3x, close & open door 2x, turn key 5x, close & open door) worked for my 2002 Rodeo.
You normally do not have to reprogram the key when you replace the battery. If you do you will have to contact your VW dealer.
2006 jetta tdi both key remote not working