Toyota MR2 Back Up Light Bulb Size

The Toyota MR2 back up light uses 1156 and P21W bulb sizes for the rear illumination components. Data provided for the specific bulb requirements covers the period from 1985 through 1995.

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
1991-1995	1156
1985-1989	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 Toyota MR2 uses the 1156 bulb size for the back up light across the 1985-1989 and 1991-1995 model years.
The 1156 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by all compliant manufacturers.
The 1156 operates on a 12-volt circuit and draws 21 watts, which is consistent with standard automotive reverse lighting applications.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin. This base type is not interchangeable with BA15d fittings, which carry two offset pins for dual-filament bulbs.
The 1156 is a single-filament bulb, meaning it serves one lighting function only. This distinguishes it from dual-filament types such as the 1157, which share the same bayonet shell but are electrically and physically incompatible due to the differing pin configuration.