The Scion xD brake light utilizes a 7443 bulb size for illumination within the rear housing assembly. Data for the specific 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 Scion xD uses the 7443 bulb across all brake light positions for the 2008-2014 model years.
The 7443 is an ANSI-standard bulb recognized in the US and Canada, operating at 12 volts with a dual-filament wedge configuration in a T20 form factor.
Its dual-filament design carries two wattage ratings: 21W for the high-intensity brake function and 5W for the lower-intensity running or tail function.
The T20 wedge base means the bulb seats directly into a wedge-style socket without a separate metal base, which is a common trait of this bulb family.
For the Scion xD outer brake position, the 7443 specification applies through July 2014, indicating a mid-year production cutoff for that model year.
Because the same 7443 bulb covers both the general brake and outer brake positions across all listed years, a single bulb type serves the full brake lighting system on this vehicle.
The 7443 shares its T20 wedge base with the related 7440 bulb, but the 7440 is a single-filament variant; substituting a 7440 for a 7443 would result in the loss of one filament function.