Free Key Fob Remote Programming Instructions for a Buick Century Time needed: 5 minutes. CLOSE all doors. INSERT key into Ignition and turn to ON . • Buick Century. • Buick Regal. REQUIRED TOOLS: • None. INSTRUCTIONS FOR BUICK CENTURY, BUICK REGAL, AND OLDSMOBILE. How to Program a Buick Century Keyless Entry Remote Fob Smart Key Step by Step How to Programming Instructions: IMPORTANT: Before entering.