Pontiac J2000 Sunbird Back Up Light Bulb Size

The Pontiac J2000 Sunbird back up light requires a bulb size of 1156 for the rear lighting system. Data for the specific bulb requirements covers the range from 1984 to 1985.

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
1984-1985	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 1156 is the bulb type specified for the backup light on the Pontiac J2000 Sunbird across the 1984-1985 model years.
The 1156 follows the ANSI standard, which means it conforms to a defined set of electrical and physical specifications recognized across the United States and Canada.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent backup lighting applications in passenger vehicles of this era.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from dual-contact bayonet variants.
Because the 1156 is a single-filament bulb, it serves one lighting function only, making it distinct from dual-filament types such as the 1157, which handle two functions from a single housing.
The BA15s base type is not interchangeable with BA15d bases, as the latter uses two offset pins and is designed for dual-contact applications.