Subaru Forester Map Light Bulb Size

The Subaru Forester map light utilizes a DE3175 bulb size for illumination within the interior cabin area of the vehicle. Provided data covers a range from 1998 through 2018 for the specified 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
1998-2018	DE3175

Bulb Specifications

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

Other Locations

Additional Notes

The Subaru Forester map light takes a DE3175 bulb across all listed model years from 1998-2018.
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 or pins.
The DE3175 operates at 12 volts, which is consistent with standard automotive electrical systems.
The 31mm figure in the DE3175 designation refers to the length of the bulb, which is the critical fitment specification for festoon bulbs since the end caps must bridge the socket contacts correctly.
The DE3175 conforms to ANSI standards, meaning it meets a defined specification recognized in both the United States and Canada.
Because festoon bulbs are held in place by spring-loaded socket contacts rather than a locking base, a bulb of incorrect length will either fall free or fail to make reliable electrical contact.