Nissan 810 Back Up Light Bulb Size

The Nissan 810 back up light requires 1156 and P21W bulb sizes for the lighting systems. Data for the specific components covers the range from 1979 through 1981.

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
1979-1981	1156

Bulb Specifications

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

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Additional Notes

The 1156 is the sole bulb type listed for the Nissan 810 back up light across the 1979-1981 model years.
The 1156 operates on a 12-volt electrical system and draws 21 watts, placing it in the mid-range of standard automotive incandescent output.
A single filament is the defining electrical characteristic of the 1156, meaning it serves one lighting function only, which aligns with its role as a dedicated back up light bulb.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a bayonet fitting with a 15mm collar and a single contact pin, distinguishing it from the dual-pin BA15d variant used in twin-filament bulbs.
The 1156 carries ANSI standardization applicable to the US and Canadian markets, indicating the specification conforms to a defined North American industry standard rather than a proprietary or regional-only format.
Because the BA15s base accepts only single-filament bulbs, a dual-filament bulb with a BA15d base is not a compatible substitute for this application on the Nissan 810.