The Suzuki Swift brake component utilizes a 1157 bulb size for illumination across the specific vehicle generations listed in the provided technical data. Recorded information spans from 1989 to 2001 for the specified automotive lighting application.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Swift uses the 1157 bulb for the brake lights across the 1989-2001 model years. This is the most consistently specified bulb in these specifications.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output and a BAY15d bayonet base. The dual-filament design allows a single bulb to serve both the brake light and a lower-intensity running light function.
The BAY15d bayonet base on the 1157 features two offset pins, which physically prevents incorrect installation of a single-filament bulb in its place. A single-filament 1156 bulb, which uses a BA15s base with symmetrical pins, is not a direct mechanical substitute.
The center high mount stop light on the Suzuki Swift uses the 921 bulb for the 1990-2001 model years. The 921 is a wedge-type T15 bulb rated at 12V and 16W with a single filament.
The 1989 Suzuki Swift center high mount stop light is specified with the 1156 bulb rather than the 921. The 1156 uses a BA15s bayonet base and operates at 12V with a 21W single filament, making it a different fitment from the wedge-style 921 used in later years.
The 921 and 1156 are not interchangeable. The 921 uses a wedge base while the 1156 uses a BA15s bayonet base, meaning the socket type in the housing determines which bulb is compatible.
All three bulb types specified, the 1157, 921, and 1156, conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across those designations.
The 1157 and 1156 share the same 21W high-output filament rating, but the 1157 carries an additional 5W filament. Installing a 1156 in a socket designed for a 1157 would result in the loss of the lower-intensity filament function.