INFINITI G37 Map Light Bulb Size

The INFINITI G37 map light utilizes 12961 and DE3175 bulb sizes for the interior lighting system. Data for the specific components covers the range from 2008 through 2013.

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
2009-2013	12961
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 G37 map light uses two distinct bulb types across its production years, with the 12961 appearing in 2009-2013 models and the DE3175 specified for the 2008 model year.
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 two wire contacts embedded in it, eliminating the need for a separate socket pin or bayonet fitting.
The W2.1x9.5d base designation describes the wedge base width and pin spacing, which determines physical fitment into the bulb socket.
The DE3175 is an ANSI-standardized festoon bulb used in the 2008 G37, measuring 31mm in length with end-cap contacts at both ends of the cylindrical body.
Festoon bulbs make electrical contact through metal caps pressed against spring-loaded holders, a mounting method that is mechanically distinct from the wedge socket used by the 12961.
Because the DE3175 and 12961 use different base types, festoon and wedge, they are not interchangeable with each other despite both operating on a 12V automotive circuit.
The 2008 INFINITI G37 map light socket is designed to accept a festoon-style bulb, meaning a wedge-type replacement such as the 12961 would not seat correctly in that application.