Subaru XT front and rear turn signal bulbs utilize a 1156 bulb size across both locations. The replacement chart covers 1985 to 1991 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru XT uses the 1156 bulb for both its front and rear turn signals across all model years covered, spanning 1985-1991.
The 1156 is a single-filament bulb, meaning it is dedicated to one lighting function rather than serving dual purposes such as combined stop and turn signal operation.
It operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive turn signal power requirements.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The 1156 conforms to ANSI standards and is recognized across both the United States and Canada, reflecting a widely distributed specification within North American automotive applications.
Because the Subaru XT (1985-1991) uses the same 1156 bulb in all four turn signal positions, a single bulb type services the entire turn signal system on the vehicle.
The BA15s designation indicates a single-contact bayonet base with a 15mm cap, distinguishing it from the BA15d, which carries two contacts and is used in dual-filament applications.
The 1156 is not interchangeable with the visually similar 1157 bulb, as the 1157 uses a BA15d dual-contact base and a two-filament design that is electrically and physically incompatible with single-contact sockets.