The Hino SG19 front turn signal requires a 1156 or 1157 bulb size, while the rear turn signal uses a P21W or 1157 bulb size. The replacement chart covers 1987 to 1992 production years 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 SG19 front turn signal uses the 1156 bulb for model years 1989-1992 and the 1157 bulb for 1987-1988.
The rear turn signal on the Hino SG19 follows the same split: P21W for 1989-1992 and 1157 for 1987-1988.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The 1157 is an ANSI-standard dual-filament bulb rated at 12V with filaments at 21W and 5W, fitted with a BAY15d bayonet base.
The P21W is an ECE-standard single-filament signalling bulb rated at 12V and 21W, also fitted with a BA15s bayonet base.
Although the 1156 and P21W share the BA15s bayonet base and identical 12V/21W ratings, they originate from different standardization systems, ANSI and ECE respectively.
The BAY15d base of the 1157 is physically distinct from the BA15s base shared by the 1156 and P21W, making the 1157 non-interchangeable with either of those two bulbs without a socket adapter.
The 1157 dual-filament design means it carries two separate circuits within one bulb, which is a functional difference from the single-filament 1156 and P21W types used in other SG19 model years.
For 1987-1988 SG19 models, both the front and rear turn signals use the same 1157 bulb, whereas 1989-1992 models use different bulb types across those two positions.