The Hino FF17 front and rear turn signal bulbs utilize 1156 and 1157 size specifications. The replacement chart covers 1987 to 1991 vehicle production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino FF17 uses two distinct bulb types across its front and rear turn signal positions: the 1156 for model years 1989-1991 and the 1157 for model years 1987-1988.
The 1156 is a single-filament bulb operating at 12V and 21W, fitted with a BA15s bayonet base, and classified under the ANSI standard applicable in the United States and Canada.
The 1157 is a dual-filament bulb rated at 12V with filaments drawing 21W and 5W respectively, mounted on a BAY15d bayonet base, and also classified under the same ANSI standard.
The BA15s base of the 1156 and the BAY15d base of the 1157 are physically distinct and not interchangeable, as the BAY15d features offset pins to prevent incorrect installation of a single-filament bulb in a dual-filament socket.
The front and rear turn signal positions on the Hino FF17 share the same bulb type for each given model year, with 1989-1991 requiring the 1156 in both positions and 1987-1988 requiring the 1157 in both positions.
Although both the 1156 and 1157 share a 21W rating on their primary filament, the 1157 carries an additional 5W filament, which is typically used for parking or running light functions in dual-purpose sockets.
The transition from the 1157 to the 1156 between the 1988 and 1989 model years reflects a shift from a dual-filament to a single-filament configuration in both the front and rear turn signal circuits of the Hino FF17.