The Daihatsu Rocky front and rear turn signal bulbs both require a 1157 size bulb for proper operation. The replacement chart covers vehicle production spanning 1990 to 1992.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is the bulb type specified for both the front and rear turn signals of the Daihatsu Rocky across the 1990-1992 model years.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1157 operates on a 12-volt electrical system and draws 21 watts on its primary filament and 5 watts on its secondary filament.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin base. The offset pin placement prevents incorrect insertion, as the two pins are positioned at different heights on the base.
The 1157 conforms to ANSI standards and is specified for use in the United States and Canada, reflecting a standardized North American fitment.
Because the same bulb type is specified for both the front and rear turn signal positions, the 1157 is interchangeable between those two locations on the Daihatsu Rocky.
The BAY15d base of the 1157 is not interchangeable with single-pin bayonet bases such as the BA15s, which is found on single-filament bulbs like the 1156. Substituting an incompatible base type would result in improper fitment.