INFINITI FX35 Map Light Bulb Size

The INFINITI FX35 map light utilizes 12961 and DE3175 bulb sizes for the interior illumination system. 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 map 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 integrated wire contacts, which locks directly into a matching socket without a separate holder.
The DE3175 is an ANSI-standard festoon bulb recognized across the US and Canadian markets, with a 31mm length and end-cap contacts at both terminals.
Festoon bulbs make electrical contact through metal caps at each end, requiring a spring-clip holder rather than a wedge or bayonet socket.
The FX35 (2009-2012) uses the 12961 wedge bulb for the map light, while the 2003-2008 model years use the DE3175 festoon bulb.
The two bulb types are not interchangeable, as the wedge and festoon formats use fundamentally different socket and contact designs.
Both bulb types operate on a 12V circuit, consistent with standard automotive electrical systems.
The DE3175 specification does not carry a listed wattage rating in these records, whereas the 12961 is explicitly rated at 5W.
Selecting the correct bulb requires confirming the model year first, given that the socket type changed between the 2008 and 2009 FX35.