The Oldsmobile Cutlass Calais brake light uses 1157 and 2057 bulb sizes for the rear lighting system. Available data covers the specific time range from 1978 through 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Cutlass Calais uses two bulb types across its brake light positions: the dual-filament 2057 and 1157, both of which follow the ANSI standard and share the BAY15d bayonet base.
The BAY15d base is common to both the 2057 and 1157, meaning the socket is physically the same for both bulbs. However, the 2057 operates at 26.9W on its high-filament circuit, while the 1157 operates at 21W, making them electrically distinct despite their physical similarity.
The 2057 is the predominant brake bulb across the Cutlass Calais lineup, appearing in the 1983 and 1988-1991 model years for the main brake light position.
The 1157 is specified for the Oldsmobile Cutlass Calais in the 1978-1982 and 1984 model years for the main brake light position.
The center high mount stop light (CHMSL) on the Cutlass Calais uses different bulb types depending on the model year. The 1989 and 1990 models use the 3155, while the 1988 and 1991 models use the P21W.
The P21W follows the ECE standard rather than the ANSI standard used by the other bulbs in these specifications. It uses a BA15s single-contact bayonet base, which is not interchangeable with the BAY15d base found on the 2057 and 1157.
The 3155 is a single-filament wedge-base bulb, categorized as a T25 type. Its wedge base is physically incompatible with the bayonet bases used by the other bulb types in these specifications.
Both the P21W and the 3155 are single-filament bulbs rated at 21W and 27W respectively, in contrast to the dual-filament design of the 2057 and 1157 used in the main brake light position.
The CHMSL position on the 1988 and 1991 Cutlass Calais calls for the P21W, while the 1989 and 1990 models call for the 3155. These two bulbs use different base types and are not interchangeable with each other.
The dual-filament construction of the 2057 and 1157 allows a single bulb to serve both brake and tail light functions within one housing, with separate filaments handling each circuit at different wattages.