Acura TSX Back Up Light Bulb Size

The Acura TSX back up light utilizes a 7440 bulb size for the rear illumination system. Data for the specific component covers the period from 2004 through 2010.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2004-2010	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

Other Locations

Additional Notes

The 7440 bulb is the specified back up light size for the Acura TSX across all documented model years, spanning 2004-2010.
The 7440 is classified under the T20 wedge base family, a designation that refers to the bulb's wedge-style base, which secures directly into the socket without a separate metal base or pins.
The 7440 operates at 12 volts and 21 watts, consistent with standard automotive electrical systems.
As a single-filament bulb, the 7440 is designed to perform one lighting function only, which aligns with its role as a dedicated back up light.
The 7440 conforms to ANSI standards as recognized in both the United States and Canada.
The T20 wedge family includes both single-filament and dual-filament variants. The 7440 is the single-filament version, while the 7443 is its dual-filament counterpart. These two types are not interchangeable due to differences in filament configuration and socket compatibility.