Disable gm security key feature?

Your 2002 Buick Rendezvous has a high security chip system. Your 2003 Impala does not have a high security system. The best way to solve this issue is just to order another key for your 2002 Buick Rendezvous from Amazingkeys.com. That way you don't need to try to bypass the system (which you can't) and you will keep your Buick all original. Here is the link to the picture of the key and the instructions: