Scion FR-S Dome Light Bulb Size

The Scion FR-S dome light uses a DE3175 bulb size for interior illumination. Replacement bulb specifications in the chart cover 2013 to 2016 model years.

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
2013-2016	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 dome light bulb size for the Scion FR-S across all available model years, spanning 2013-2016.
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 or pins.
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 the figure used to match the bulb to a compatible festoon socket.
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 rather than a proprietary one.
Because festoon bulbs are sized primarily by length, a DE3175 replacement must match the 31mm length to seat correctly within the dome light fixture of the FR-S.
The consistent use of the DE3175 across the full 2013-2016 production run indicates that the dome light socket specification did not change during that period.