Toyota Corona Back Up Light Bulb Size

The Toyota Corona back up light utilizes 1156 and P21W bulb sizes for illumination. Data for the specific lighting components covers the period from 1973 to 1982.

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	US Type	EU Type	Shop
1973-1982	1156	P21W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price

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Additional Notes

The Toyota Corona uses the 1156 bulb for the back up light across all listed model years from 1973 to 1982.
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 a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive incandescent output for reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb locks into the socket with a twist, as opposed to a double-contact BA15d base used on dual-filament variants.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, indicating broad availability across North American markets.
Because the BA15s base is single-contact only, it is not interchangeable with physically similar double-contact bayonet bulbs such as the 1157, despite the shared base size.