The Honda Accord brake light components utilize 921, 7440, and 2057 bulb sizes according to the specific technical data provided for the vehicle. The information covers a span of time starting from 1976 through 2020.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Accord brake bulb specifications cover three distinct bulb types across the brake light position: the 2057, 921, and 7440, each representing a different base design and wattage rating.
The 2057 is the most frequently specified bulb across the Honda Accord brake light data, appearing across the 1976-1978 and 1982-1985 model years, as well as 1991.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W. Its dual-filament design allows it to serve both brake and tail light functions within a single housing.
The 2057 is described as a brighter variant of the 1157, sharing the same BAY15d bayonet base. This means the two types are physically interchangeable in terms of fitment, though the 2057 produces greater output on its high filament.
The 1990-1991 Honda Accord Center High Mount Stop Light uses the 3497 bulb, a single-filament type with a BA15s bayonet base rated at 12V and 21W. The BA15s base differs from the BAY15d base of the 2057, making these two bulb types non-interchangeable despite both using bayonet-style mounts.
The 3497 is a variant of the 1156 and shares its BA15s base, meaning a 1156 bulb is a compatible substitute for the 3497 in the Center High Mount Stop Light position on those model years.
The 2018 Honda Accord brake light uses the 7440, a single-filament wedge bulb in a T20 form factor, rated at 12V and 21W. Its single-filament design means it is dedicated solely to the brake light function rather than a combined brake and tail application.
The 921 is specified for the 2020 Honda Accord brake light. It is a wedge-type bulb in a T15 form factor, rated at 12V and 16W. The T15 form factor is physically smaller than the T20 used by the 7440, and the two are not interchangeable despite both being wedge-base types.
The 921 and 7440 both use wedge bases but differ in body size and wattage, with the 921 drawing 16W and the 7440 drawing 21W. Substituting one for the other would result in either a physical fitment mismatch or an incorrect light output level.
All four bulb types listed in the specifications, the 921, 7440, 2057, and 3497, conform to ANSI standards applicable in both the United States and Canada.