The Hino 338 headlight bulb utilizes 9003 and H6054 bulb sizes for both high beam and low beam applications. Replacement chart data spans 2005 to 2014 model years 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 9003 bulb is a dual-filament halogen type, meaning a single bulb serves both the high beam and low beam functions through two separate filaments. It operates at 12 volts, with the high beam filament rated at 60 watts and the low beam filament rated at 55 watts, and it uses a P43t base.
The Hino 338 uses the 9003 bulb for both high beam and low beam headlights across the 2006-2014 model years.
The 9003 is an ANSI-standardized type recognized in the United States and Canada, which means it conforms to a defined performance and fitment standard rather than being a proprietary specification.
The 2005 Hino 338 uses the H6054 for both its high beam and low beam headlights, which is a fundamentally different headlight format from the 9003 used in later model years.
The H6054 is a 5x7-inch rectangular sealed beam unit, meaning the lens, reflector, and filament are fused into a single assembly. When the filament fails, the entire unit is replaced rather than just an internal bulb.
Because the 2005 model year relies on a sealed beam unit while the 2006-2014 model years use a socketed halogen bulb, the two headlight formats are not interchangeable with one another.
The H6054 sealed beam also operates at 12 volts, which it shares with the 9003, though the two types differ in construction, form factor, and replacement method.