Oldsmobile Toronado Back Up Light Bulb Size

The Oldsmobile Toronado back up light utilizes 1156 and P21W bulb sizes for the lighting components. Data for the specified vehicle covers the range from 1966 through 1992.

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
1966-1992	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 Oldsmobile Toronado uses the 1156 bulb for its back up lights across all listed model years, spanning 1966-1992.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its application in a back up light circuit.
The 1156 operates at 12 volts and 21 watts, placing it in the standard range for incandescent automotive reverse lighting.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, as opposed to the dual-pin BA15d base found on some other automotive bulbs.
The BA15s base is not interchangeable with the BA15d base, and substituting one for the other is not possible without modification.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
The single-filament design of the 1156 distinguishes it from the visually similar 1157, which carries a dual filament and a dual-contact BA15d base, making the two bulbs incompatible despite their comparable physical size.