2009 Cadillac CTS Owner's Manual - Page 366

3. Remove the electrical connector from the bulb by lifting the two plastic clips. 4. Remove the bulb socket from the lamp housing by turning the bulb socket one-quarter turn counterclockwise. 5. Pull the old bulb from the lamp housing keeping the bulb straight as you pull it out. 6. Install a new bulb. 7. Reinstall the electrical connector by pushing in the two plastic clips. 8. Push the bulb socket into the lamp housing and turn the socket one-quarter turn clockwise. License Plate Lamp To replace one of these bulbs, do the following: 1. Push tab to remove the license plate lamp. 2. Turn the license plate lamp assembly down to remove it. 5-60