Pontiac Bonneville Map Light Bulb Size

The Pontiac Bonneville map light utilizes bulb sizes 578, 212-2, 562, 1004, and 906 depending on the specific production period. Data for the lighting components covers the range from 1962 through 2003.

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
2000-2003	578
1997-1999	212-2
1987-1991	562
1984-1985	1004
1982	1004
1980	1004
1979	906
1962-1970	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

Other Locations

Additional Notes

The Pontiac Bonneville map light specifications cover model years 1962 through 2003, with five distinct bulb types used across that span: the 578, 212-2, 562, 1004, and 906.
The 578 is a festoon bulb rated at 12V and 12W, measuring 41mm in length with end-cap contacts. It is the specified map light bulb for the Pontiac Bonneville in model years 2000-2003.
The 212-2 is also a 41mm festoon bulb rated at 12V and 12W, but it uses an SV8.5 base rather than end-cap contacts. It is specified for model years 1997-1999.
Although the 578 and 212-2 share the same voltage, wattage, and physical length, their base types differ. The end-cap contacts of the 578 are not interchangeable with the SV8.5 base of the 212-2, making substitution between the two incompatible without a socket adapter.
The 562 is a festoon bulb rated at 12V and 12W with end-cap contacts, but its length is 44mm rather than 41mm. It is specified for model years 1987-1991.
The 3mm length difference between the 562 and the 578 or 212-2 is a fitment consideration, as festoon bulbs rely on physical tension between their end caps and the socket contacts to maintain a secure connection.
The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W. It is described as a variant of the 1157 and is specified across the widest range of model years in these specifications, covering 1962-1970 and 1980-1985.
The dual-filament design of the 1004 provides two separate wattage outputs (21W and 5W), a characteristic associated with bulbs serving both primary and secondary lighting functions, though in this application it is designated solely for the map light position.
The 906 is a miniature wedge bulb of the T10 type, rated at 12V and 8W. It is the specified map light bulb exclusively for the 1979 model year, and its wedge base construction differs fundamentally from the festoon and bayonet types used in surrounding model years.
All five bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across the range.