Subaru Loyale Back Up Light Bulb Size

The Subaru Loyale back up light uses 1156 and P21W bulb sizes according to the provided specifications for the lighting components. Data for the specific bulb sizes covers the range from 1990 to 1994.

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
1990-1994	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 Subaru Loyale uses the 1156 bulb for the back up light across all listed model years, spanning 1990-1994.
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 within the standard low-voltage DC range used in automotive electrical systems.
The bulb uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
The 1156 designation follows ANSI standards applicable in both the United States and Canada, indicating a standardized specification rather than a proprietary or regional-only part.
Because the BA15s base is a single-contact design, it is not interchangeable with dual-contact bayonet bulbs such as the 1157, despite the physical similarity of the base housing.