Nissan D21 Back Up Light Bulb Size

The Nissan D21 back up light uses a 1156 bulb size for replacement applications. The replacement chart covers vehicle production spanning 1986 to 1994.

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
1986-1994	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 sole back up light bulb size specified for the Nissan D21 across its 1986-1994 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American standard recognized in both the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive incandescent output for reverse lighting applications.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin. This base type requires a specific socket and is not interchangeable with dual-contact bayonet bases such as the BA15d.
The 1156 is a single-filament bulb, meaning it serves one lighting function only. This distinguishes it from dual-filament types like the 1157, which share the same BA15s-style housing family but carry a second contact pin and are electrically incompatible with single-contact sockets.