Pontiac 1999 Firebird - Manual (Page 287)

yellow blue
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Headlamps
Before replacing a headlamp bulb that does not light,
check to make sure that the wiring connector is securely
fastened to it.
See “Replacement Bulbs” in the Index to check the type
of headlamp bulb you need to use before you begin to
replace the headlamp bulb. You must replace a
headlamp bulb with one that is exactly the same.
To replace a headlamp:
1. Open the headlamp door by turning the headlamps
on, then turning the switch back to the parking lamps
position. See “Headlamp Doors” in the Index.
2. Remove the bezel using a Phillips screwdriver on the
three main screws.