The Lexus ES350 back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified bulb covers the range from 2007 to 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is an ANSI-standard wedge type in the T15 form factor, rated at 12 volts and 16 watts, and is used across all listed model years for the back up light on the Lexus ES350.
The 3057 bulb is also an ANSI-standard wedge type, but in the larger T25 form factor. It carries a dual-filament design rated at 12 volts with a 27-watt primary filament and a 7-watt secondary filament.
For the standard back up light position, the 921 bulb applies uniformly across all 2007-2018 model years without variation.
The inner back up light position shows a bulb change between model years. The 3057 applies to 2007-2011, while the 921 applies to 2013-2018.
The 921 and 3057 are not interchangeable. Beyond the difference in wattage, the 3057 carries a dual-filament design that the single-filament 921 does not share, and the two occupy different T-series form factors.
The 2013-2014 inner back up light entries carry a Japan Product Part designation, indicating those fitments correspond to vehicles assembled in Japan rather than domestic production variants.
The Japan Product Part designation appears only on the 2013 and 2014 inner back up light rows, both of which specify the 921 bulb.
Both the 921 and 3057 are rated at 12 volts, consistent with standard automotive electrical systems.