Scion xB Dome Light Bulb Size

The Scion xB dome light requires a DE3175 bulb size for proper installation and function within the interior cabin lighting system. Available data covers the range from 2004 through 2015 for the specified vehicle and 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
2008-2015	DE3175
2004-2006	DE3175

Bulb Specifications

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

Other Locations

Additional Notes

The Scion xB uses the DE3175 bulb size for the dome light across all listed model years from 2004-2015, with the exception of 2007, which does not appear in the specifications.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket or pins.
Festoon bulbs are held in place by spring-loaded clips within the dome light housing, with the end caps pressing against the contacts to complete the circuit.
The DE3175 designation indicates a 31mm length, which is the critical fitment factor for festoon bulbs, as a shorter or longer bulb will not make proper contact with the housing clips.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The DE3175 follows ANSI standards applicable in both the United States and Canada, meaning the specification is consistent across North American markets.
The "DE" prefix in the DE3175 designation identifies it as a double-ended festoon bulb, distinguishing it from single-contact or wedge-base bulb types that are not interchangeable with this fitment.