2003 Buick Regal Owner's Manual - Page 259
2003 Buick Regal Manual
Page 259 highlights
Center High-Mounted Stoplamp (CHMSL) 1. Open the trunk. 3. Remove the old bulb by turning it one-quarter turn counterclockwise. 4. Push the new bulb into the bulb socket. 2. Reach through the access opening in the trunk lid. 5. Turn the socket one-quarter turn clockwise to reinstall. 5-54
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