The Toyota T100 back up light utilizes 1156 and P21W bulb sizes according to the provided data. Information for the specified lighting components covers the period from 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 is the sole bulb type specified across all back up light positions on the Toyota T100, covering both the standard and outer back up light applications.
The 1156 is an ANSI-standard single-filament bulb rated at 12 volts and 21 watts, designed for use in North American markets.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the pin is centered on the base, distinguishing it from double-contact variants such as the 1157.
The Toyota T100 back up light uses the 1156 across the 1993-1998 model years for the standard position.
The outer back up light position on the T100 also uses the 1156 for the 1995-1998 model years.
Because the BA15s base is a single-contact design, substituting a double-contact bayonet bulb such as the 1157 is not compatible, as the base configurations are physically and electrically distinct.