Chevrolet Impala Map Light Bulb Size

The Chevrolet Impala map light utilizes specific bulb sizes 578, 192, 1004, and 562 depending on the specific production period. Available data covers the range from 1962 through 2013.

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
2006-2013	578
2000-2005	192
1994-1996	192
1982-1985	1004
1978	1004
1962-1970	562

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	192
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562

Other Locations

Additional Notes

The Chevrolet Impala map light specifications cover four distinct bulb types across its model history: the 578, 192, 1004, and 562.
The 578 and 562 are both festoon-style bulbs operating at 12V and 12W, with end-cap contacts. The 578 is 41mm in length, while the 562 is 44mm. Despite their near-identical electrical ratings, the 3mm difference in length means the two types are not interchangeable.
The 578 festoon bulb is specified for the Chevrolet Impala map light across the 2006-2013 model years.
The 562 festoon bulb is specified for the 1962-1970 model years.
The 192 is a miniature wedge bulb of the T10 form factor, rated at 12V and 3W. Its wedge base design requires no separate socket retainer, as the bulb body itself creates the electrical contact when inserted.
The 192 wedge bulb is specified for the 1994-2005 model years, with the exception of 1997-1999.
The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments at 21W and 5W. It is noted as a variant of the widely used 1157 bulb type.
The 1004 bayonet-base bulb is specified for the 1978 and 1982-1985 model years.
All four bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada.
The power ratings across these bulb types vary considerably, from 3W for the 192 wedge up to 12W for the festoon types, reflecting differences in the lighting technology used across the Impala's production span.