Oldsmobile 1999 Intrigue - Manual (Page 284)

yellow blue
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4. Place the new bulb into the socket.
5. Turn the bulb one - quarter of a turn clockwise
to replace.
6. Close the trunk.
Tail/Stop/Turn Signal lamp
1. Unscrew the wing nut inside of the trunk (1) behind
the taillamp to be changed (if equipped with a
convenience net, unhook the convenience net).
2. Pull back the carpeting.
3. Remove the plastic wing nuts (2). (Pliers may be
required to remove the wing nuts.)
4. Pull the taillamp housing away from the body of the
vehicle (3).
5. Squeeze the tab on the bulb socket and turn the
socket counterclockwise.