The Toyota Venza back up light requires a bulb size of 921 for the rear lighting assembly. Data for the specified component covers the range from 2009 through 2012.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Toyota Venza uses the 921 bulb for the standard back up light position across the 2009-2012 model years.
The 921 is an ANSI-standard single-filament wedge bulb in the T15 form factor, rated at 12 volts and 16 watts.
The inner back up light position on the 2009-2012 Venza takes the 3057 bulb.
The 3057 is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12 volts with a 27-watt primary filament and a 7-watt secondary filament.
Because the 921 and 3057 differ in filament count, wattage, and form factor, the two bulb types are not interchangeable between the standard and inner back up light positions.
The dual-filament design of the 3057 means it is capable of serving two distinct lighting functions, though in this fitment it is specified solely for the inner back up light role.
The 2009 inner back up light fitment carries a production date qualifier of "From 11/2008," indicating the 3057 specification applies to units built from November 2008 onward within that model year.