Subaru RX front and rear turn signal bulbs both utilize a 1156 size bulb for proper operation. The replacement chart covers vehicle production spanning 1985 to 1989 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 RX uses the 1156 bulb for both the front and rear turn signals across the 1985-1989 model years.
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 incandescent turn signal applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the bulb is inserted and rotated to lock into place.
The BA15s designation indicates a single-contact base with a 15mm collar, which distinguishes it from the BA15d double-contact variant used in dual-filament applications.
The 1156 conforms to ANSI standards as recognized in the United States and Canada, indicating a standardized specification for socket fit and electrical output.
Because the same bulb type is specified for both front and rear positions on the Subaru RX, the 1156 is interchangeable between those two locations on this vehicle.