The Lexus LS430 back up light utilizes 921 and 7440 bulb sizes according to the provided specifications for the lighting system. Data for the specific bulb sizes covers the range from 2001 through 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus LS430 back up light specifications cover the 2001-2006 model years, with two distinct bulb types used across that span: the 921 and the 7440.
The 921 is an ANSI-standard wedge bulb in a T15 form factor, rated at 12V and 16W, and is used in the LS430 back up lights for the 2004-2006 model years.
The 7440 is an ANSI-standard single-filament wedge bulb in a T20 form factor, rated at 12V and 21W, and is used in the LS430 back up lights for the 2001-2003 model years.
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, due to differences in body size and wattage.
The 7440 draws 21W compared to the 921's 16W, meaning the two bulbs differ in power consumption and light output, which is a relevant factor when considering cross-compatibility.
The Lexus LS430 Inner Back Up Light underwent a mid-cycle bulb change during the 2003 model year. Units produced up to July 2003 use the 7440, while units produced from July 2003 onward use the 921.
For the 2003 LS430, the production date is a critical factor in determining the correct Inner Back Up Light bulb, as both the 921 and 7440 apply to that year depending on the build date.
Both the 921 and 7440 are ANSI-standard bulbs rated for use in the US and Canadian markets, meaning they conform to standardized electrical and physical specifications within those regions.
For the 2004-2006 model years, both the standard back up light and the Inner Back Up Light use the same 921 bulb, indicating a unified fitment across those positions in that period.
For the 2001-2002 model years, both the standard back up light and the Inner Back Up Light also share the same bulb type, the 7440, reflecting a consistent fitment across positions in those earlier years as well.