Cadillac Seville Map Light Bulb Size

Additional Notes

• The Cadillac Seville map light bulb specifications span model years 1978 through 2004, covering four distinct bulb types across that range.
• The 168 bulb is the most frequently specified type in these records, covering the 1992-2004 model years. It is a T10 miniature wedge bulb rated at 12V and 4.9W, conforming to ANSI standards for the US and Canadian markets.
• The 1004 bulb is the second most common type in these specifications, appearing across the 1978-1988 model years with the exception of 1981. It is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W, and is noted as a variant of the widely known 1157 bulb.
• The 562 festoon bulb, rated at 12V and 12W, is specified for the Cadillac Seville in 1981, 1990, and 1991. Its 44mm length and end-cap contact design distinguish it physically from the wedge and bayonet types used in other years.
• The 906 bulb is specified only for the 1989 model year. Like the 168, it uses a T10 miniature wedge form factor, though it operates at a higher wattage of 8W compared to the 168's 4.9W, making the two bulbs electrically incompatible despite sharing the same base type.
• The T10 wedge base shared by the 168 and 906 bulbs does not make them interchangeable for the Cadillac Seville, as the wattage difference between the two types reflects a meaningful distinction in their electrical draw and light output.
• The 1004 bulb's dual-filament design, a characteristic it shares with the 1157 family, is atypical for a map light application, where single-filament bulbs are more common. The specifications record it as the designated type for the applicable Seville model years regardless.
• All four bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada, indicating consistent regulatory compliance across the full model year range covered.