The Lexus GS460 back up light utilizes a 921 bulb size for illumination purposes within the rear housing assembly. Data for the specific component covers the range from 2008 through 2011.
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 back up light positions on the Lexus GS460 for the 2008-2011 model years.
The 921 is classified as a wedge-type bulb with a T15 base, operating at 12 volts and rated at 16 watts.
The T15 designation refers to the bulb's tubular shape, with the number indicating its width in eighths of an inch, and the wedge base style means the bulb is held in place by the socket gripping its tapered plastic base rather than by pins or a bayonet fitting.
The 921 carries ANSI standardization, meaning its physical and electrical characteristics conform to a defined North American specification recognized in both the United States and Canada.
Both the standard back up light and the inner back up light positions share the same 921 bulb size across all listed model years, indicating interchangeability between those two positions on the GS460.
The 2008 inner back up light position carries a production date qualifier of "From 09/2007," meaning the 921 fitment for that position applies only to vehicles produced from September 2007 onward within the 2008 model year.