INFINITI FX35 Dome Light Bulb Size

The INFINITI FX35 dome light utilizes bulb size 12961 and bulb size DE3175 for interior illumination. Available data for the specified lighting components covers the range from 2003 to 2012.

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
2009-2012	12961
2003-2008	DE3175

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The INFINITI FX35 dome light specifications cover model years 2003-2012 and reference two distinct bulb types across that span.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge form factor uses a plastic wedge base with wire contacts rather than a separate metal socket, which is a common construction for low-wattage interior lighting applications.
The DE3175 follows the ANSI standard recognized in the United States and Canada, and it is a festoon-type bulb with a 31mm length and end-cap contacts at each terminal.
Festoon bulbs make electrical contact through metal caps at both ends of the glass tube, a design that differs fundamentally from the wedge base of the 12961.
The two bulb types are not interchangeable, as the wedge base of the 12961 and the end-cap contact design of the DE3175 are physically incompatible with each other's sockets.
FX35 model years 2009-2012 use the 12961 bulb for the dome light position.
FX35 model years 2003-2008 use the DE3175 bulb for the dome light position.
The 12961 carries an explicit wattage rating of 5W, while the DE3175 specification lists only a 12V operating voltage without a stated wattage value.
The shift from the DE3175 to the 12961 between the 2008 and 2009 model years reflects a change in the dome light socket type, making year verification necessary before sourcing a replacement bulb.