The GMC S15 Jimmy front and rear turn signal bulbs both utilize a 2057 size bulb for proper operation. The replacement chart covers vehicle production spanning 1983 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC S15 Jimmy uses the 2057 bulb for both front and rear turn signals across the 1983-1991 model years.
The 2057 is a dual-filament bulb, meaning it contains two separate filaments within a single housing, allowing it to serve more than one lighting function.
The 2057 operates on a 12-volt electrical system, with wattage ratings of 26.9W on the high-intensity filament and 8W on the low-intensity filament.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically locks the bulb into its socket through a twist-and-seat motion.
The 2057 is classified as an ANSI standard bulb, meaning its specifications are standardized for use across the United States and Canada.
The 2057 is described as a brighter variant of the 1157 bulb. While the two share the same BAY15d base and are physically interchangeable in many sockets, the 2057 produces greater output on its high-intensity filament.
Because the 2057 and 1157 share the same base type, the 1157 is sometimes substituted in applications calling for the 2057, though the lower wattage of the 1157 results in reduced brightness on the high-intensity filament.