Nissan 300ZX Back Up Light Bulb Size

The Nissan 300ZX back up light utilizes 1156 and P21W bulb sizes for the rear exterior lighting system. Available information covers the specific time range from 1984 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
1984-1996	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 Nissan 300ZX uses the 1156 bulb for the back up light position across all model years listed, spanning 1984-1996.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American industry standard applicable in both the US and Canada.
The 1156 operates at 12 volts and 21 watts, which is consistent with standard automotive reverse lighting power requirements.
The 1156 is a single-filament bulb, meaning it serves only one lighting function, as opposed to dual-filament types that handle two functions such as braking and running light from a single unit.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width, a common automotive socket type.
The BA15s designation indicates the bulb has one contact pin at the base, which is a key fitment detail distinguishing it from the visually similar BA15d base found on dual-filament bulbs such as the 1157.
Because the 1156 and 1157 share the same 15mm bayonet base width but differ in contact configuration, substituting one for the other is not electrically compatible despite a partial physical fit.