How do you replace Headlights on Cadillac DTS 2002?

To replace the headlights on a 2002 Cadillac DTS, first, ensure the vehicle is turned off and the keys are removed. Open the hood and locate the headlight assembly; you may need to remove screws or clips to access it. Disconnect the electrical connector from the back of the headlight bulb, then twist and remove the old bulb. Insert the new bulb, reconnect the electrical connector, and secure the headlight assembly back in place. Finally, test the lights to ensure they are functioning properly.