The Hino FA1517 high beam headlight uses an H4651 bulb size while the low beam headlight requires an H4656 bulb size. The replacement chart covers vehicle production years spanning 1998 to 2004 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino FA1517 uses the H4651 bulb size for high beam headlights and the H4656 for low beam headlights across the 1998-2004 model years.
Both the H4651 and H4656 are ANSI-standardized sealed beam units recognized in the United States and Canada, conforming to a 4x6-inch rectangular form factor.
A sealed beam unit integrates the filament, reflector, and lens into a single fused assembly, meaning the entire unit is replaced rather than an internal bulb.
Both units operate at 12 volts, consistent with standard automotive electrical systems.
Although the H4651 and H4656 share the same physical 4x6-inch rectangular sealed beam format, they are not interchangeable, as each is designated for a specific beam function on the Hino FA1517.
The H4651 is rated for high beam output, while the H4656 is rated for low beam output; the differing ANSI codes reflect distinct filament configurations and light distribution patterns within otherwise similar housings.