The Scion xB tail light utilizes a specific 7443 bulb size for illumination across all listed vehicle applications. Data provided covers a span from 2004 through 2015 for the specified lighting component.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Scion xB outer tail light uses the 7443 bulb size across all listed model years, spanning 2004-2015 with the exception of 2007.
The 7443 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by all compliant manufacturers.
This bulb follows the T20 wedge form factor, which refers to its tapered, pin-free base that seats directly into a wedge-style socket without requiring a separate locking mechanism.
The 7443 operates on a 12-volt system and carries a dual-filament design rated at 21 watts and 5 watts, where the higher-wattage filament typically serves the brake or turn signal function and the lower-wattage filament serves the running light function.
Because the 7443 is a dual-filament bulb, it is not directly interchangeable with single-filament alternatives such as the 7440, which shares the same T20 wedge base but lacks the second filament needed to perform both lighting functions in the same socket.