Volvo S70 Back Up Light Bulb Size

The Volvo S70 back up light requires a bulb size of 1156 for the rear lighting assembly. Data for the specified bulb size covers the range from 1998 to 2000.

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
1998-2000	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 specified back up light bulb size for the Volvo S70 across the 1998-2000 model years.
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 at 21 watts, which is consistent with standard automotive reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb locks into the socket with a twist.
The 1156 carries ANSI standardization for the US and Canadian markets, indicating it conforms to a defined set of electrical and physical criteria recognized across those regions.
Because the BA15s base is a single-contact design, it is not interchangeable with the BA15d base found on dual-filament bulbs such as the 1157, despite the sockets appearing similar in size.