Chevrolet Cavalier Map Light Bulb Size

The Chevrolet Cavalier map light utilizes bulb sizes 168, 906, and 90. Available data for the specific components spans from 1982 through 2005.

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

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

The Chevrolet Cavalier map light specifications reference three distinct bulb sizes across its production years: the 168, 906, and 90.
The 168 and 906 are both T10 miniature wedge bulbs operating at 12V, though they differ in wattage. The 168 draws 4.9W while the 906 draws 8W, making them electrically incompatible despite sharing the same physical base type.
The 90 bulb uses a BA15s single-contact bayonet base, a fundamentally different mounting and connection style from the T10 wedge base used by the 168 and 906. This makes the 90 non-interchangeable with either of the other two bulb types.
All three bulb types conform to ANSI standards recognized in both the United States and Canada.
The Chevrolet Cavalier (2000-2005) uses the 168 bulb for the map light across all six of those model years.
The 906 bulb is the most frequently specified type in these records, appearing across the 1983-1984, 1987, and 1990-1993 model years.
The 90 bulb is specified for the 1982, 1985, 1988, and 1989 model years, with the 1987 model year returning to the 906 between two periods of 90 usage.
Because the 168 and 906 share the T10 wedge form factor, physical fitment in the socket may be possible between the two, but the wattage difference means power draw would not match the original specification if one is substituted for the other.