1999 Cadillac DeVille Owner's Manual - Page 309
1999 Cadillac DeVille Manual
Page 309 highlights
yellowblue Center High-Mounted Stoplamp (CHMSL) 1. Lift the trim cover to remove. 2. Twist the socket counterclockwise and remove the socket and bulb from the housing. 3. Replace the bulb. Reverse the steps to reassemble the stoplamp assembly. 6-39