Oldsmobile 1999 Aurora - Manual (Page 278)

yellow blue
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5. Pull out the taillamp assembly to reach the bulb and
pull it out. To replace, push the bulb back in.
6. Reverse Steps 1 through 5 to replace the taillamp
filler, wing nuts and carpeting.
Rear Turn Signal
The rear turn signal bulb is located on the outboard edge
of the taillamp assembly. Follow the taillamp procedure
for replacing a turn signal bulb.
Back-Up Lamps
To replace a back - up lamp, do the following:
1. Remove the license plate to expose the bulb cover.