Subaru Legacy Map Light Bulb Size

The Subaru Legacy map light utilizes a DE3175 bulb size for the interior illumination component located inside the cabin ceiling. Provided data covers a span of time starting from 1990 through 2024.

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
2021-2024	DE3175	Check Price
2008-2019	DE3175	Check Price
1990-1999	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 map light bulb size specified for the Subaru Legacy across all listed model years, spanning 1990-2024.
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.
The DE3175 operates at 12 volts, which is consistent with standard automotive electrical systems.
The "31mm" designation in the DE3175 refers to the length of the bulb, which is the critical fitment factor for festoon bulbs installed in fixed-length holders.
The DE3175 conforms to ANSI standards applicable in the United States and Canada, indicating a standardized specification rather than a proprietary one.
Because festoon bulbs are held by tension between two end contacts, the 31mm length must match the holder spacing precisely; a bulb of a different length would not seat correctly even if the voltage rating were the same.
The DE3175 designation is shared across a wide span of Legacy model years, indicating that the map light holder geometry remained consistent throughout those generations.