Chevrolet Corsica Back Up Light Bulb Size

The Chevrolet Corsica back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the lighting components. Data for the lighting equipment covers the range from 1987 through 1996.

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
1987-1996	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Chevrolet Corsica uses the 1156 bulb for the back up light position across all documented model years, spanning 1987-1996.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its role as a dedicated back up light.
The 1156 operates at 12 volts and 21 watts, placing it in the standard range for reverse lighting applications in 12-volt automotive electrical systems.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d base found on other bulb types.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
Because the BA15s base is a single-contact design, it is not interchangeable with visually similar bulbs that use a dual-contact BA15d base, such as the 1157, despite the bayonet mounting style being outwardly alike.
The single-filament construction of the 1156 also means it cannot substitute for dual-filament bulbs used in combination stop and tail light sockets, even where the base type physically fits.