Subaru SVX Back Up Light Bulb Size

The Subaru SVX back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the lighting components. Available data covers the range from 1992 to 1997 for the specified vehicle.

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
1992-1997	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 1156 is the sole back up light bulb size listed for the Subaru SVX across all model years covered by these specifications, spanning 1992-1997.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American standard recognized in both the United States and Canada.
The 1156 operates on a 12-volt electrical system 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 positioned symmetrically on the base, allowing only one correct seating orientation relative to pin placement.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types such as the 1157, which handle two functions from a single housing.
Because the 1156 is single-filament, it is not interchangeable with dual-filament bayonet-base bulbs even when the base size physically matches, as the internal pin configuration and wattage differ.
The BA15s base is shared by several other bulb types, so base compatibility alone does not confirm that an alternative bulb is a correct fitment for the SVX back up light position.