Volvo S60 Cross Country Back Up Light Bulb Size

The Volvo S60 Cross Country back up light requires a bulb size of H21W for the specified lighting component. Data for the bulb size covers the range from 2016 to 2018.

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
2016-2018	H21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W

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Additional Notes

The H21W is the sole bulb type listed for the Volvo S60 Cross Country backup light across the 2016-2018 model years.
The H21W follows the ECE (Economic Commission for Europe) standard, a regulatory framework adopted across Europe and numerous other markets worldwide.
This bulb operates on a 12-volt electrical system, which is the standard automotive voltage for passenger vehicles.
At 21 watts, the H21W falls within the higher end of the single-filament signalling bulb power range, a characteristic typical of backup and turn signal applications that require strong, visible output.
The single-filament design of the H21W means it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as stop and tail lighting simultaneously.
The H21W uses a BAY9s base, a bayonet-type fitting with an offset pin configuration. The asymmetrical pin placement of the BAY9s base ensures the bulb can only be seated in one orientation, preventing incorrect installation.
The BAY9s base is specific to the H21W and is not shared with common bulb types such as the BA15s or BAY15d, making direct substitution with those bases incompatible for the S60 Cross Country backup light socket.