The Honda CRX brake light requires a bulb size of 2057 for the rear lighting system. Data for the specified component covers the range from 1988 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda CRX uses the 2057 bulb for brake lighting across all four model years covered, spanning 1988-1991.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, operating at 12V with a wattage split of 26.9W for the high-intensity filament and 8W for the low-intensity filament.
As a dual-filament design, the 2057 serves both brake and running light functions within a single housing, which is typical for combined stop/tail lamp applications.
The 2057 is a brighter variant of the 1157 bulb. While the two share the same BAY15d bayonet base and are physically interchangeable in many cases, the higher wattage of the 2057 produces greater light output on the brake filament.
The BAY15d base features two offset pins at different heights, which prevents incorrect insertion and ensures consistent filament orientation within the socket.
The center high mount stop light on the Honda CRX uses the 921 bulb for all four model years, 1988-1991.
The 921 is a single-filament wedge-type bulb in the T15 form factor, operating at 12V and 16W. Its wedge base requires no separate metal base, as the glass envelope itself acts as the retaining element within the socket.
The 2057 and 921 are both classified under ANSI standards applicable to the US and Canadian markets, indicating standardized electrical and physical specifications across those regions.
Because the 2057 and 1157 share the same base type, substitution is physically possible, but the difference in filament wattage means the two are not rated identically and may not meet original equipment output levels interchangeably.