The Toyota T100 front and rear turn signal bulbs both utilize a 1156 size bulb for proper operation. The replacement chart covers vehicle production spanning 1993 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 bulb is the sole turn signal bulb type specified for the Toyota T100 across all listed model years, covering both front and rear positions from 1993-1998.
The 1156 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared by all compliant manufacturers.
The 1156 operates on a 12-volt circuit and draws 21 watts, which is consistent with standard automotive turn signal power requirements.
As a single-filament bulb, the 1156 serves one lighting function per socket, distinguishing it from dual-filament types such as the 1157, which handle two functions from a single housing.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design is directly tied to its single-filament construction.
Because the 1156 and 1157 share the same BA15s-style housing profile, physical fitment of a 1157 into a 1156 socket is possible in some cases, but the differing contact configurations make such substitution electrically incompatible for correct turn signal operation.
The front and rear turn signal positions on the T100 use the same 1156 bulb specification, so a single bulb type covers all four turn signal sockets on the vehicle.