Nissan 240SX Back Up Light Bulb Size

The Nissan 240SX back up light utilizes 1156 and P21W bulb sizes for the rear illumination system. Data for the specified components covers the period from 1989 through 1998.

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
1989-1998	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 Nissan 240SX uses the 1156 bulb for the back up light across all model years from 1989 to 1998.
The 1156 is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail duties.
It operates on 12 volts at 21 watts, which is consistent with standard automotive electrical systems.
The 1156 uses a BA15s bayonet base, a single-contact mount 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 across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by multiple manufacturers.
Because the BA15s base is a single-contact design, it is not interchangeable with visually similar bayonet-base bulbs that carry two offset pins, such as the 1157, despite the similar base size.