Cadillac DeVille Map Light Bulb Size

Additional Notes

• The Cadillac DeVille map light specifications span from 1953 to 2005, with eight distinct bulb types used across that period: 578, 214-2, 168, 562, 906, 1004, 89, 90, and 212-2.
• The 562 festoon bulb is the most frequently recurring type in the specifications, appearing across the 1974-1976, 1978-1981, and 1991-1993 model years, as well as 1971 through the early 1980s in various groupings.
• The 578 and 214-2 bulbs are both 41mm festoon types rated at 12V and 12W, though they differ in base design. The 578 uses end-cap contacts, while the 214-2 uses an SV8.5 base, making them physically non-interchangeable despite sharing identical voltage and wattage ratings.
• The 212-2 and 214-2 share the same 41mm festoon form with an SV8.5 base and identical 12V, 12W ratings. The Cadillac DeVille (2000 and 2003) used the 214-2, while the 1962-1964 models used the 212-2.
• The 1004 bulb, used in the Cadillac DeVille across the 1982-1988 model years and also in 1977, is a dual-filament type with a BAY15d bayonet base rated at 12V and 21/5W. It is described as a variant of the 1157, and its dual-filament design distinguishes it from all other bulb types listed in these specifications.
• The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W, used across the 1994-1999 model years. The 906 is also a T10 miniature wedge but operates at a higher 8W, and it was used in the 1989-1990 models. These two bulbs share the same base form factor but are not wattage-equivalent.
• The 89 and 90 bulbs both use a BA15s single-filament bayonet base and share a 12V, 13W rating. The 89 is noted as a lower wattage variant of the 1156. The 90 was used in the 1953-1960 and 1965-1966 DeVille models, while the 89 appeared in the 1967-1971 models.
• The 562 festoon bulb measures 44mm in length, making it physically longer than the 578, 214-2, and 212-2 festoon types, all of which are 41mm. Substituting one festoon size for another risks fitment failure in the lamp housing.
• All bulb types listed in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating consistent regulatory compliance across the full model range covered.
• The 1004 bulb's BAY15d bayonet base is an offset double-contact fitting, which is mechanically distinct from the BA15s single-contact base used by the 89 and 90 bulbs. Cross-substitution between these base types is not physically possible.