The Lexus LX570 back up light utilizes a 921 bulb size for the rear illumination system. Data for the specific component covers the range from 2008 through 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 the sole bulb size specified across all listed model years of the Lexus LX570 for both the standard back up light and the inner back up light positions.
The 921 bulb is a T15 wedge-base type, meaning it uses a plastic wedge at its base rather than a metal pin or bayonet fitting, and it seats directly into a matching socket without a separate holder.
Operating at 12 volts and 16 watts, the 921 is a relatively low-wattage incandescent bulb, which is typical for reverse light applications in passenger vehicles.
The 921 designation follows ANSI standards applicable in the United States and Canada, indicating a standardized specification for physical size, wattage, and voltage.
The standard back up light position uses the 921 bulb across the 2008-2018 Lexus LX570, with the exception of 2012, which is not present in the specifications.
The inner back up light position on the Lexus LX570 carries a production date restriction for the 2008 model year, specifying fitment from November 2007 onward, which reflects a mid-production-year change rather than a full-year application.
The inner back up light for the 2017 model year is specified only through August 2017, indicating that vehicles produced after that date fall outside this particular fitment entry.
Because both the standard and inner back up light positions share the same 921 bulb size, the two positions are electrically and physically compatible with the same replacement bulb, though they remain distinct installation locations on the vehicle.