The Lexus SC430 back up light requires a 7440 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the period from 2002 through 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus SC430 uses the 7440 bulb for its back up light across all model years covered in the specifications, spanning 2002-2010.
The 7440 is a single-filament wedge bulb classified under the T20 form factor, operating at 12 volts with a power rating of 21 watts.
The T20 wedge base design means the bulb is retained by the socket through friction rather than a bayonet or screw mechanism, which is a common trait in many rear lighting applications.
The 7440 designation follows the ANSI standard recognized in both the United States and Canada, placing it within a standardized North American bulb classification system.
The single-filament construction of the 7440 means it serves one lighting function only, which aligns with its dedicated role as a back up light rather than a combined stop and tail application.
The outer back up light position on the Lexus SC430 also specifies the 7440 for the full 2002-2010 model year range, consistent with the general back up light specification.
Because both the back up light and the outer back up light positions share the same 7440 specification across all listed years, the bulb type is uniform throughout the rear lighting assembly for this function.
A 21-watt output at 12 volts places the 7440 in a moderate power range for incandescent automotive bulbs, typical of reverse light applications where adequate illumination behind the vehicle is required.