Volvo C70 Back Up Light Bulb Size

The Volvo C70 back up light utilizes H6W, P21W, and 1156 bulb sizes depending on the specific version of the vehicle. Available information covers a span of time starting in 1998 and ending in 2013.

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
2011-2013	H6W
2006-2010	1156
2001-2004	1156
1998	1156

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Volvo C70 backup light specifications reference two distinct bulb types across its model years: the H6W and the 1156.
The 1156 is an ANSI-standard bulb used in North American markets, operating at 12V and 21W with a BA15s single-contact bayonet base and a single filament.
The H6W follows the ECE standard used in European and worldwide markets, operating at 12V but only 6W, with a BAX9s base and a single filament.
The Volvo C70 uses the 1156 bulb for the 1998 and 2001-2010 model years in the backup light position.
The H6W bulb applies to the 2011-2013 model years of the Volvo C70 for the same backup light position.
The BA15s and BAX9s bases are physically incompatible with each other, meaning the 1156 and H6W bulbs are not interchangeable despite both being single-filament 12V types.
The wattage difference between the two bulbs is significant: the 1156 draws 21W while the H6W draws only 6W, reflecting the differing power output standards between ANSI and ECE specifications.
Both bulb types carry a single filament, which is consistent with the backup light function, as that application requires only one illumination state rather than dual-intensity operation.