Buick Keyless Entry Remote How Do I Program A Remote Keyless Entry For A 2003 Buick Rendezvous?

How do I program a Remote Keyless Entry for a 2003 Buick Rendezvous? - buick keyless entry remote

Please help. I bought a remote keyless entry, double-MY 2003 Buick Rendezvous. For the program, the dealer pays me $ 50! I know that somewhere someone knows how. Please help! A million thanks.