Mazda Mizer Back Up Light Bulb Size

The Mazda Mizer back up light uses bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the lighting components covers the range from 1976 to 1977.

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
1976-1977	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 bulb type specified for the Mazda Mizer backup light across both available model years, 1976-1977.
The 1156 follows the ANSI standard, meaning it conforms to a defined set of electrical and physical specifications recognized in the United States and Canada.
As a single-filament bulb, the 1156 serves one dedicated function per socket, which in this application is the backup light circuit.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The 1156 operates at 12 volts and draws 21 watts, consistent with standard 12V automotive electrical systems of that era.
The BA15s base designation indicates a single-contact bayonet fitting with a 15mm base width, which is not interchangeable with dual-contact variants such as the BA15d or the 1157, despite their physical similarity.