Oldsmobile 1999 Aurora - Manual (Page 276)

yellow blue
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Front Turn Signal
The front turn signal bulb is on the inboard edge of the
headlamp assembly. To replace a bulb, do the following:
1. Remove the headlamp assembly if you need more
hand clearance.
2. Reach in and press the locking tab while twisting
the bulb assembly one - quarter of a turn
counterclockwise.
3. Replace the bulb and reverse Step 2 to reassemble.
4. If you removed the headlamp assembly, reassemble
it by aligning the pin and tightening the two bolts to
secure it.
Taillamps
A. Rear Turn Signal
B. Taillamps