Kia Optima Map Light Bulb Size

The Kia Optima map light utilizes DE3175, 904, and DE3423 bulb sizes for the interior lighting components. Available information covers a specific range of production from 2001 through 2018.

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
2017-2018	DE3175 (Center)
2011-2013	DE3175 (Center, For Vehicle With Sunroof)
2011-2013	904 (Front)
2007-2010	904 (Front)
2006	DE3423 (Front, For Vehicle With Sunroof, To 9/30/2005)
2006	904 (Front, From 12/1/2005)
2002-2005	DE3423 (Front, For Vehicle With Sunroof)
2001	DE3423 (Front, For Vehicle With Sunroof, From 10/10/2000)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	904
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The Kia Optima map light specifications reference three distinct bulb types across its model years: the DE3175, the 904, and the DE3423, all of which conform to ANSI standards applicable in the United States and Canada.
The DE3175 and DE3423 are both festoon-style bulbs, meaning they are cylindrical in shape with metal end-cap contacts at each end rather than a wedge-style base. The DE3175 measures 31mm in length, while the DE3423 measures 41mm, making the two types physically incompatible with each other despite their similar construction.
The 904 is a miniature wedge bulb of the T10 type, operating at 12V with an 8W output. Its wedge base differs fundamentally from the end-cap contact design of the festoon bulbs, meaning it is not interchangeable with either the DE3175 or DE3423.
The 904 bulb is the most frequently specified type across the Kia Optima map light data, appearing as the front map light bulb from 2006 onward through 2013, as well as in 2007 and 2008.
For the 2011-2013 Kia Optima, the front position uses the 904 bulb, while the center position on vehicles equipped with a sunroof requires the DE3175 festoon bulb, indicating that two different bulb types may be present simultaneously depending on the vehicle's configuration.
The DE3423 festoon bulb is specified exclusively for vehicles equipped with a sunroof in the 2001-2006 model years, suggesting a fitment relationship between the sunroof configuration and the front map light housing used during that period.
The 2006 model year carries two separate front map light specifications distinguished by production date. Units produced up to September 30, 2005 use the DE3423, while those produced from December 1, 2005 onward use the 904, reflecting a mid-cycle change in the bulb fitment for that year.
The 2001 model year specification for the DE3423 carries a start date of October 10, 2000, indicating that not all 2001 production vehicles share the same map light fitment from the beginning of that model year's production run.
The DE3175 replaces the DE3423 as the center sunroof-position festoon bulb in the 2011-2018 model years. Since the two festoon types differ in length, substituting one for the other would result in an improper fit within the lamp housing.
For the 2017-2018 Kia Optima, only a single center map light bulb size is listed, with no front position entry present in the specifications, distinguishing these years from earlier models that carried front position fitment data.