Review on ACDelco D1489D Original Equipment Ignition by James Naylor

Installed in 99 Riviera. Works perfect. You do NOT need any programming. Simply measure the ohms of your original key and purchase blanks to cut like the keys provided and then install. When you replace a TDM (Theft Deterrent Module), the very first key you put in the cylinder will automatically program the module to recognize the ohm pellet in the key, and after that all is fine.