The Mazda 323 front turn signal requires either a 1157 or 1156 bulb size, while the rear turn signal uses a 1156 bulb size. The replacement chart covers vehicle production years spanning 1986 to 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 bulb is an ANSI-standard single-filament bulb operating at 12V with a 21W output and a BA15s bayonet base, making it the most consistently used bulb across the Mazda 323 turn signal specifications.
The 1157 bulb is an ANSI-standard dual-filament bulb operating at 12V with a 21W/5W output and a BAY15d bayonet base, distinguishing it from the 1156 by its second filament and different base configuration.
The BA15s base of the 1156 and the BAY15d base of the 1157 are physically incompatible with each other, as the bayonet pin arrangement differs between the two types.
The rear turn signal position on the Mazda 323 uses the 1156 bulb across all model years from 1986-1994.
The front turn signal position uses the 1156 bulb from 1986-1991, then transitions to the 1157 bulb for 1992-1994.
Because the 1156 and 1157 share a similar physical size but differ in base configuration and filament count, one is not a direct substitute for the other despite their numerical proximity.
The dual-filament design of the 1157 allows it to serve two lighting functions simultaneously, which accounts for its use in front turn signal positions where combined signaling functions are required.
Both the 1156 and 1157 are governed by ANSI standards applicable in the United States and Canada, meaning their electrical and physical specifications conform to a defined industry baseline.