Scion xD Dome Light Bulb Size

The Scion xD dome light requires a DE3175 bulb size for proper installation and function within the interior cabin lighting system. Provided information covers the production range from 2008 through 2014 for the specified vehicle.

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 Type	Shop
2008-2014	DE3175	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175	Check Price

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Additional Notes

The DE3175 is the sole dome light bulb size listed for the Scion xD across all documented model years, spanning 2008-2014.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in form and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips within the fixture, with the end caps pressing against the contacts to complete the circuit.
The DE3175 has a nominal length of 31mm, which is a critical fitment factor, as festoon bulbs must physically span the distance between the fixture's contact clips to seat correctly.
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, indicating a standardized specification for the bulb's physical and electrical properties.
Because the 31mm length is a fixed fitment requirement for the Scion xD dome fixture, substituting a festoon bulb of a different length, such as the 28mm DE3021 or the 36mm DE3022, would result in an improper fit.