Subaru WRX Map Light Bulb Size

The Subaru WRX map light requires a DE3175 bulb size for proper installation and function within the interior lighting housing. Data for the specified component covers the range from 2018 through 2023.

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
2023	DE3175
2018-2020	DE3175

Bulb Specifications

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

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Additional Notes

The DE3175 is the sole map light bulb type listed across all specified model years of the Subaru WRX in these records, covering 2018-2020 and 2023.
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 the standard physical span required for correct fitment in the map light housing.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The DE3175 designation follows ANSI standards applicable in the United States and Canada, indicating a defined and regulated specification for the bulb's electrical and physical characteristics.
Festoon bulbs of differing lengths, such as the 28mm DE3021 or the 36mm DE3423, are not interchangeable with the DE3175 despite sharing the same end-cap contact design, as an incorrect length will result in poor contact or failure to seat properly.