Acura ZDX Back Up Light Bulb Size

The Acura ZDX 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 range from 2010 through 2013.

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
2010-2013	7440

Bulb Specifications

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

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Additional Notes

The Acura ZDX uses the 7440 bulb size for the back up light across the 2010-2013 model years.
The 7440 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 7440 belongs to the T20 wedge bulb family, a designation that refers to its physical base style, which uses a wedge-shaped plastic base rather than a metal pin or bayonet fitting.
As a single-filament bulb, the 7440 serves one lighting function only, which aligns with its dedicated role as a back up light.
The 7440 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The bulb carries a 21-watt rating, placing it in a moderate output range typical for reverse lighting applications.
The T20 wedge base form factor is shared by several bulb numbers, and substitution with a dual-filament variant such as the 7443 is generally considered incompatible due to differing internal configurations, even though the base may physically fit.