Volvo XC70 Back Up Light Bulb Size

The Volvo XC70 back up light utilizes 1156 and P21W bulb sizes for the rear illumination system. Data for the specified lighting components covers the range from 2003 to 2007.

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
2003-2007	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 Volvo XC70 uses the 1156 bulb for the back up light across the 2003-2007 model years.
The 1156 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard used in both the United States and Canada.
The 1156 operates on a 12-volt electrical system, which is consistent with standard automotive 12V architecture.
At 21 watts, the 1156 produces a moderate output level typical of incandescent reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact mount that locks into the socket with a twist rather than a threaded connection.
The BA15s base is a single-contact type, which corresponds directly to the 1156 being a single-filament bulb with one electrical function.
The single-filament construction of the 1156 means it is not interchangeable with dual-filament bulbs such as the 1157, which shares a visually similar BA15d base but carries two separate contacts.