Scion tC Dome Light Bulb Size

The Scion tC dome light requires a DE3175 bulb size for proper installation and function within the interior cabin lighting system. Available data covers the range from 2005 through 2016 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
2009-2016	DE3175
2005-2007	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 tC uses the DE3175 bulb size for the dome light across all listed model years from 2005 to 2016, with the exception of 2008, which does not appear in the specifications.
The DE3175 is a festoon-style 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.
The DE3175 designation follows the ANSI standard recognized in both the United States and Canada, placing it within a standardized North American bulb classification system.
The bulb has a 31mm length, which is the critical fitment factor for festoon bulbs, as the end caps must span the contact points within the fixture housing.
The DE3175 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
Because the DE3175 is an ANSI-standardized festoon bulb, it is shared across a wide range of vehicle makes and models, meaning aftermarket and OEM replacements are broadly available under this designation.
The consistent use of the DE3175 across the 2005-2016 Scion tC model years indicates that the dome light housing and contact spacing remained unchanged throughout the vehicle's production run as listed in the specifications.