Acura RDX Dome Light Bulb Size

The Acura RDX dome light utilizes a DE3175 bulb size for the interior lighting system. Available data covers the range from 2007 through 2018 for the specified vehicle component.

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
2007-2018	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Acura RDX dome light takes the DE3175 bulb across all listed model years, spanning 2007-2018.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and seats by pressing lengthwise between two spring-loaded end contacts rather than inserting into a socket.
The DE3175 has a 31mm length, which is the measurement between its two end-cap contacts and determines whether it will fit correctly within a given festoon housing.
The bulb operates at 12 volts, consistent with standard automotive electrical systems.
The DE3175 designation follows ANSI standards recognized in both the United States and Canada, meaning the specification reflects a standardized part number rather than a proprietary one.
Because the DE3175 is an ANSI-standardized festoon bulb, equivalent bulbs from different manufacturers sharing the same designation are generally interchangeable, provided the 31mm length and end-cap contact design are maintained.
Festoon bulbs of differing lengths, such as the 28mm DE3021 or the 36mm DE3423, are not interchangeable with the DE3175 even though they share the same contact style, as the length must match the housing span in the Acura RDX (2007-2018).