The Lexus GX470 back up light utilizes a 7440 bulb size for illumination purposes. Available data for the specified component covers the period from 2003 to 2009.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440 bulb is the sole bulb type specified for the back up lights on the Lexus GX470, covering all model years from 2003-2009.
The 7440 is an ANSI-standard bulb recognized in the United States and Canada, classified under the T20 wedge form factor with a single filament.
Operating at 12 volts and 21 watts, the 7440 is a relatively high-output single-filament bulb, which is typical for reverse lighting applications that require strong rearward illumination.
The T20 wedge base design means the bulb seats directly into a wedge-style socket without a separate metal base, a common construction in modern automotive lighting.
Both the standard back up light and the inner back up light positions on the GX470 share the same 7440 specification across all listed model years, indicating full interchangeability between those two positions.
The inner back up light for the 2003 model year carries a production date qualifier of "From 11/2002," meaning this specification applies only to units manufactured from November 2002 onward within that model year.