Oldsmobile Firenza Map Light Bulb Size

The Oldsmobile Firenza map light requires bulb size 562 or 90 depending on the specific vehicle configuration. Data for the lighting components covers the range from 1982 to 1988.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1988	562
1986-1987	90
1982	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The 1987-1986 and 1982 Oldsmobile Firenza map light uses the 90 bulb, while the 1988 model uses the 562 bulb.
The 562 is a festoon-type bulb measuring 44mm in length, making contact through end caps at both terminals rather than through a base socket.
The 90 bulb uses a BA15s bayonet base, a single-pin mount that locks into its socket with a quarter-turn motion.
Both bulb types operate at 12 volts, consistent with standard automotive electrical systems.
The 90 bulb is rated at 13W, while the 562 is rated at 12W, placing both within the low-wattage range typical of interior lighting applications.
Both the 562 and 90 are ANSI-standardized bulbs recognized in the US and Canada, meaning they conform to defined performance and physical specifications.
The 90 and 562 are not interchangeable, as they differ in base type, physical form, and mounting method.
The shift from the 90 bulb to the 562 in the 1988 Firenza reflects a change in socket design between model years, requiring a festoon-compatible housing rather than a bayonet socket.