How do you replace headlight on 2006 Cadillac DTS?

To replace the headlight on a 2006 Cadillac DTS, start by opening the hood and locating the headlight assembly. Remove the plastic cover or screws securing the assembly, then carefully pull the assembly out. Disconnect the electrical connector from the back of the headlight bulb, then remove the old bulb by turning it counterclockwise. Insert the new bulb, reconnect the electrical connector, and reassemble the headlight assembly.