Cadillac Seville Dome Light Bulb Size

The Cadillac Seville dome light utilizes unique bulb sizes 168, 562, 906, 912, 1004, and 212-2 across various production versions. Data for the lighting components covers the range from 1976 to 1992.

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
1992	168
1991	562
1989-1990	906
1985-1988	912
1984	1004
1981	1004
1979-1980	562
1978	212-2
1976-1977	562

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2

Other Locations

Additional Notes

The bulb 912 is the most frequently specified dome light bulb across the Cadillac Seville's model history, covering the 1985-1988 model years. It is a T15 wedge bulb rated at 12V and 12W, and it is classified as a variant of the 921 bulb.
The 562 festoon bulb appears across four model years of the Seville: 1976, 1977, 1979, 1980, and 1991. It operates at 12V and 12W, with a 44mm length and end-cap contacts that seat against metal contacts at each end of the bulb holder rather than using a base socket.
The 906 bulb is specified for the 1989-1990 model years. Like the 168, it uses a T10 miniature wedge base, but it draws more power at 8W compared to the 168's 4.9W, making the two bulbs electrically incompatible despite sharing the same base form factor.
Because the 906 and 168 both use a T10 wedge base, physical fitment between the two is possible, but their wattage ratings differ. Substituting one for the other without accounting for the wattage difference may affect circuit performance or bulb longevity.
The 1004 bulb, specified for the 1981 and 1984 model years, is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 21/5W. It is a variant of the 1157 bulb. The dual-filament design is atypical for a dome light application, where single-filament bulbs are more common.
The 212-2 festoon bulb, specified for the 1978 Seville, uses an SV8.5 base and measures 41mm in length. The 562 festoon bulb, used in other model years, measures 44mm. These two festoon bulbs are not interchangeable due to the difference in length and base type.
All bulb types listed across the Seville's dome light specifications conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and physical tolerances across all entries.
The 912 bulb is rated at 12W, the same wattage as the 562 and 212-2 festoon bulbs, though all three use entirely different base types and physical formats, making cross-substitution between them impossible without a socket adapter.
The 1992 Seville uses the 168 bulb, a T10 miniature wedge type rated at 4.9W. This is the lowest wattage of any bulb specified across all listed model years of the Seville's dome light fitment data.
The Seville's dome light specifications span from 1976 to 1992 and reference six distinct bulb types, reflecting changes in socket design and electrical specifications across different generations of the vehicle.