Hyundai Sonata Map Light Bulb Size

Additional Notes

• The 904 bulb is a T10 miniature wedge type rated at 12V and 8W. It uses a wedge base, meaning it is held in place by friction rather than a locking mechanism, and requires no separate socket for installation.
• The DE3175 and DE3423 are both festoon-type bulbs that make contact through metal end caps pressed against spring clips inside the housing. The DE3175 measures 31mm in length, while the DE3423 measures 41mm. These two sizes are not interchangeable despite sharing the same contact style.
• The Hyundai Sonata uses all three bulb types across its model years, with the 904 and DE3175 appearing most frequently throughout the range covered by these specifications.
• For the 2021-2024 Sonata, the map light takes a single 904 bulb across all four years with no positional distinctions noted.
• The 2016 and 2017 Sonata each require two different bulb sizes simultaneously, with the 904 serving the front map position and the DE3175 serving the center position. Using the wrong size in either position would result in an improper fit.
• The 2000-2004 Sonata uses the DE3423, which is a longer festoon bulb than the DE3175 used in surrounding model years. Substituting a DE3175 in a housing designed for the DE3423 would leave the bulb too short to maintain contact with the spring clips.
• The 2008 and 2010 model years carry production cutoff dates within the specification entries, indicating that the listed bulb sizes apply only to vehicles built before those respective dates.