The Cadillac Cimarron brake light utilizes 1157 and 2057 bulb sizes for the rear lighting system. Data for the specified components covers the period from 1982 through 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Cadillac Cimarron brake light specifications cover model years 1982-1988, with the 1157 bulb type appearing in six of those seven years, making it the most frequently specified bulb across this application.
The 1157 is a dual-filament bulb operating at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base, conforming to ANSI standards for the US and Canadian markets.
The dual-filament design of the 1157 allows a single bulb to serve both brake and running light functions, with the lower-wattage filament handling continuous illumination and the higher-wattage filament activating under braking.
The 1986 Cadillac Cimarron brake light specification calls for the 2057 bulb rather than the 1157 used in surrounding model years, representing a departure from the otherwise consistent fitment pattern.
The 2057 shares the BAY15d bayonet base with the 1157 and is also a dual-filament 12V bulb, but operates at 26.9W and 8W respectively, producing greater output on both filaments.
Although the 1157 and 2057 share the same BAY15d base type, their differing wattage ratings indicate they are not identical replacements, and substituting one for the other may affect light output relative to the original specification.
The Center High Mount Stop Light (CHMSL) on the Cimarron, present in the 1986-1988 specifications, uses the 1156 bulb, which is a single-filament unit on a BA15s bayonet base operating at 12V and 21W.
The BA15s base of the 1156 is physically distinct from the BAY15d base of the 1157 and 2057, meaning the CHMSL socket and the standard brake light socket are not interchangeable.
The single-filament configuration of the 1156 reflects the dedicated stop-only function of the CHMSL, which does not require a secondary running light filament.
All three bulb types specified for the Cimarron, the 1157, 2057, and 1156, conform to ANSI standards applicable in both the United States and Canada.