The Lexus LX470 back up light uses 921 and 7440 bulb sizes depending on the specific production period for the vehicle. Available information covers the range from 1998 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus LX470 back up light specifications cover model years 1998-2007, with two distinct bulb types used across that span: the 921 and the 7440.
The 921 is an ANSI-standard wedge bulb in the T15 form factor, rated at 12V and 16W, and is used in both the standard and inner back up light positions for the 2003-2007 LX470.
The 7440 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, drawing 5 watts more than the 921 at the same operating voltage.
The T15 and T20 designations refer to the tubular bulb body size, with T20 being physically larger than T15. These two types are not interchangeable despite both using a wedge base.
For the standard back up light position, the Lexus LX470 used the 7440 from 1998-2002 and transitioned to the 921 from 2003-2007.
The inner back up light position on the 1998-2001 LX470 requires the 7440, consistent with the standard position during those years.
The 2002 model year presents a split fitment for the inner back up light: vehicles produced through August 2002 take the 7440, while those produced from August 2002 onward take the 921.
The 1998 inner back up light specification carries a production date qualifier of "From 01/1998," indicating the fitment applies to vehicles built from January of that year.
In the 2002 model year, the standard back up light position retained the 7440 for the entire year, while the inner position transitioned mid-year to the 921, meaning both bulb types could be present simultaneously on a single 2002 vehicle depending on its production date.
Both the 921 and 7440 carry ANSI standardization for the US and Canadian markets, meaning either type is available across multiple brands and is not exclusive to a single manufacturer.