The Scion xD tail light utilizes a 7443 bulb size for the rear illumination system. Data for the specified component covers the period from 2008 through 2014.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 is the sole bulb type specified across all listed positions for the Scion xD tail light application. It is an ANSI-standard dual-filament wedge bulb of the T20 form factor, rated at 12 volts with a 21W/5W filament configuration. The higher-wattage filament serves the brake or turn signal function, while the lower-wattage filament serves the running light function.
The 7443 specification applies to the Scion xD outer tail light across the 2008-2014 model years, with the 2014 application carrying a production cutoff of July 2014, after which the specification no longer applies to that model year.
The T20 wedge base of the 7443 is a push-in, twist-lock type, meaning it seats into the socket without a separate bayonet locking mechanism. Substituting a single-filament bulb in a dual-filament socket would result in the loss of one lighting function, as the socket is wired to activate each filament independently.
The 7443 is recognized under ANSI standards in both the United States and Canada, indicating consistent part numbering and electrical specifications across those markets. This standardization means the bulb is widely available under the same designation from multiple manufacturers.