The UD 1400 uses 1156 bulb size for both front and rear turn signal applications. The replacement chart covers 1995 to 1998 vehicle production 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 1156 is the sole bulb type specified for the UD 1400 across all listed turn signal positions and model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function per socket rather than combining two functions such as braking and signaling into a single unit.
It operates on a 12-volt electrical system and draws 21 watts, placing it in the standard incandescent range for automotive turn signal applications.
The 1156 uses a BA15s bayonet base, which is a single-contact bayonet mount. The "s" designation indicates a single contact point at the base, distinguishing it from the dual-contact BA15d variant.
The 1156 carries ANSI standardization recognized in both the United States and Canada, reflecting a widely adopted specification in North American vehicle markets.
Both the front and rear turn signal positions on the UD 1400 share the same 1156 bulb specification across the 1995-1998 model years.
Because the front and rear sockets accept the same bulb type, a single replacement unit is physically interchangeable between both positions on this vehicle.
The BA15s base is not interchangeable with the BA15d base. A dual-contact bulb such as the 1157 will not seat correctly in a socket designed for the single-contact 1156, even though the physical housing may appear similar.