Scion tC front and rear side marker bulbs utilize 168 and 7443 bulb sizes depending on location and model generation. The replacement chart covers vehicle production spanning 2005 to 2016 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 168 bulb is an ANSI-standard miniature wedge type with a T10 form factor, rated at 12V and 4.9W. Its low wattage reflects its role as a low-intensity marker lamp rather than a primary lighting source.
The 7443 bulb is an ANSI-standard dual-filament wedge type with a T20 form factor, rated at 12V with a 21W/5W output. The dual-filament design allows one filament to serve a higher-intensity function and the other a lower-intensity function within the same housing.
Both the 168 and 7443 bulbs conform to ANSI standards recognized in the United States and Canada, meaning they follow defined specifications for base type, voltage, and wattage within those markets.
The Scion tC uses the 168 bulb across all listed model years (2005-2016) for the front side marker position, making it the consistent front fitment throughout the vehicle's production span covered by these specifications.
The rear side marker position on the Scion tC is not uniform across all years. The 168 bulb applies to the 2014-2016 rear position, while the 7443 applies to earlier listed years, indicating a change in rear marker lamp design between those production periods.
The T10 and T20 designations refer to the wedge base size of each bulb. A T20 base is physically larger than a T10, meaning the 168 and 7443 are not interchangeable despite both being wedge-type bulbs.
The wattage difference between the 168 (4.9W) and the 7443 (21W/5W) is substantial. Substituting one for the other would result in incorrect light output and potential electrical incompatibility with the vehicle's circuit design.