Subaru Crosstrek Dome Light Bulb Size

Additional Notes

• The DE3175 is the sole dome light bulb type listed across all model years of the Subaru Crosstrek covered in these specifications, spanning 2017-2024.
• The DE3175 follows the ANSI standard, which governs bulb dimensions and electrical ratings for the United States and Canadian markets.
• This bulb belongs to the festoon family, a cylindrical form factor that seats between two end-cap contacts rather than using a bayonet or wedge base.
• The festoon body measures 31mm in length, which is the defining physical characteristic that distinguishes it from other festoon sizes such as the DE3021 or DE3022.
• The DE3175 operates at 12 volts, consistent with standard automotive electrical systems.
• Because festoon bulbs rely on contact pressure at both ends, a bulb of incorrect length will either fail to make contact or fit too loosely, making the 31mm specification a critical fitment factor.
• The DE3175 and DE3022 are both 31mm festoon bulbs but use different contact styles, so not all 31mm festoon bulbs are interchangeable with the DE3175 despite sharing the same length.