Honda Prelude front and rear turn signal bulbs utilize 7440, 1156, 2057, and 3497 sizes depending on location and model variation. The replacement chart covers 1979 through 2001 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Prelude front turn signal specifications cover model years 1979 through 2001, while rear turn signal specifications cover the same range, with three distinct bulb types appearing across both positions over that span.
The 7440 is a single-filament wedge bulb using a T20 base, rated at 12V and 21W. It is an ANSI-standard type used in both the front and rear turn signal positions of the Honda Prelude for model years 1997-2001.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. It is the most widely used bulb type across the Prelude's turn signal specifications, appearing in the front position from 1983-1993 and in the rear position from 1979-1990.
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. It is specified only for the front turn signal on the Honda Prelude for model years 1979-1982.
The 3497 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and is a variant of the 1156. It is specified exclusively for the rear turn signal position on the Prelude for model years 1992-1996.
Although the 1156 and 3497 share the same BA15s bayonet base and identical voltage and wattage ratings, they are listed as distinct ANSI types. Physical interchangeability between them is not confirmed by the specifications alone, and substitution without verification of the exact base and filament configuration carries a fitment risk.
The 2057 uses a BAY15d bayonet base, which is a dual-contact base physically distinct from the single-contact BA15s base used by the 1156 and 3497. These base types are not interchangeable, meaning a 2057 cannot be substituted into a socket designed for a 1156 or 3497.
The 7440 uses a T20 wedge base, which is mechanically incompatible with the bayonet-style bases of the 1156, 3497, and 2057. Sockets for earlier Prelude model years are not designed to accept a T20 wedge fitment.
The front and rear turn signal positions do not always share the same bulb type for a given model year. For the 1992-1996 Prelude, the front position uses the 7440 or 1156 while the rear uses the 3497, making it necessary to treat each position as a separate fitment specification.
The 2057 is described as a brighter variant of the 1157, operating at a higher wattage on its primary filament. Its dual-filament design distinguishes it functionally from all other bulb types listed in these specifications, which are all single-filament.