The Lexus ES300 back up light utilizes 921, 7440, 1156, and P21W bulb sizes depending on the specific application. Available information covers the range from 1992 through 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus ES300 back up light specifications cover model years 1992-2003, with three distinct bulb types used across that span: the 1156, 7440, and 921.
The 1156 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 21W, and follows the ANSI standard for the US and Canada markets.
The 7440 is a single-filament wedge bulb in a T20 form factor, also rated at 12V and 21W, and likewise carries ANSI certification for US and Canada use.
The 921 is a wedge bulb in a T15 form factor, rated at 12V and 16W, making it the lowest wattage of the three bulb types specified for this vehicle.
Although the 7440 and 1156 share the same voltage and wattage ratings, their base types differ entirely. The 7440 uses a wedge-style base while the 1156 uses a bayonet base, making them physically non-interchangeable.
The 921 and 7440 are both wedge-type bulbs, but their T15 and T20 form factors indicate different physical sizes, which affects fitment even though both are wedge-based designs.
For the Lexus ES300, the back up light used the 1156 bulb from 1992-1996, the 7440 from 1997-1999, and the 921 from 2000-2003.
The inner back up light specifications for the 1999 model year include a mid-year bulb change. Units produced through 08/1999 used the 7440, while those produced from 08/1999 onward used the 921, indicating a production revision within that single model year.
The inner back up light for the 1996 model year is noted as using the 1156 only through 08/1996, suggesting a similar mid-year transition point for that position.
The inner back up light position carries its own set of specifications separate from the general back up light, and the two positions do not always share the same bulb type for a given model year, as seen in the 1999 transition data.