The Volvo V90 brake light requires a bulb size of 1157 for the rear lighting system. Data for the specified vehicle covers the range from 1997 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo V90 uses the 1157 bulb for its standard brake lights across the 1997-1998 model years.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output, meaning its two filaments serve separate functions at different wattages within the same housing.
It uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by positioning its two pins at different heights.
The center high mount stop light on the Volvo V90 for 1997-1998 takes the 1156 bulb rather than the 1157 used in the standard brake positions.
The 1156 is a single-filament bulb rated at 12V and 21W, using a BA15s bayonet base with two pins at equal heights.
The BA15s base of the 1156 and the BAY15d base of the 1157 are physically distinct, and the two bulbs are not interchangeable despite sharing a similar external appearance and the same 15mm base width.
Both the 1157 and 1156 are ANSI-standardized bulb types recognized across the United States and Canada, meaning they conform to a defined set of electrical and physical specifications.