Oldsmobile 1999 Cutlass - Manual (Page 246)

yellow blue
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5. Press the tab on the white bulb socket and twist it
less than one - quarter of a turn counterclockwise.
6. Reconnect the wiring harness to the bulb or
lamp assembly.
7. Replace the lamp to its original position by carefully
lining up the lamp to the mounting balls.
8. Press down on the two latches. Replace the splash
shield by pushing down on the retainer.
Center High-Mounted Stoplamp (CHMSL)
1. Open the trunk and locate the CHMSL housing at the
top of the trunk.
2. Twist the bulb housing one - quarter of a turn
counterclockwise to remove it.
3. Gently remove the bulb(s) and replace with a
new one.