2003 Cadillac DeVille Owner's Manual - Page 328

Front TurnSianal, Sidemarker, Parking and Cornering Lamps 1. The turn signal lamps are located beside the headlamp bulbs. To access, lift off the bulb socket dust cover. See Steps 1 through 6 under Headlamps on page 5-53. - 3. Remove the turn signal lamp housing socket and replace the bulb. 4. Reverse Steps 1 and 2 to reinstall. 2. Press the tab down and turn the housing socket clockwise to unlock the socket from the lamp housing. 5-57