The Saturn SW1 brake light requires 2057 and 3057 bulb sizes for the rear lighting system. Data for the specified vehicle covers the range from 1993 through 1999.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn SW1 uses the 2057 bulb for the brake light across the 1996-1999 model years. This is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a high/low filament draw of 26.9W and 8W respectively.
The 2057 is noted as a brighter variant of the 1157 bulb. Both share the BAY15d bayonet base, which means the 2057 draws more wattage on its high-filament circuit while remaining physically compatible with the same socket type.
The Saturn SW1 used the 3057 bulb for the brake light during the 1993-1995 model years. Unlike the 2057, the 3057 is a dual-filament wedge-type bulb in a T25 form factor, rated at 12V with filament draws of 27W and 7W.
The 2057 and 3057 are not interchangeable despite similar wattage ratings. The 2057 uses a BAY15d bayonet base while the 3057 uses a wedge base, meaning the socket type differs between the 1993-1995 and 1996-1999 model years.
Both the 2057 and 3057 are ANSI-standard bulbs recognized in the United States and Canada, indicating they conform to a defined set of electrical and physical specifications within those markets.
The Center High Mount Stop Light on the Saturn SW1 uses the PC168 bulb for the 1995-1996 and 1998-1999 model years. This is a miniature T10 wedge bulb with a printed circuit board twist-lock socket, rated at 12V.
The 1997 Saturn SW1 Center High Mount Stop Light specifies the PC175 bulb rather than the PC168 used in surrounding model years. The PC175 is also a T10 wedge bulb with a printed circuit board twist-lock socket, rated at 12V.
The PC168 and PC175 are both designed for printed circuit board applications, which is a mounting format commonly associated with instrument clusters and compact lighting assemblies rather than standard socket housings.