BMW M6 Map Light Bulb Size

The BMW M6 map light requires bulb size 12961 or DE3423 depending on the specific version of the vehicle. Data for the provided specifications covers the range from 2006 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
2012-2018	12961
2010	DE3423
2009	12961
2008	DE3423
2006-2007	12961

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, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The BMW M6 map light specifications cover model years 2006-2018, with two distinct bulb types appearing across that range.
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 that makes direct contact with the socket, requiring no separate metal base or pins.
The DE3423 is an ANSI-standard festoon bulb measuring 41mm in length, using end-cap contacts at both ends of the cylindrical housing, also rated at 12V.
Festoon bulbs and T10 wedge bulbs use physically incompatible socket types, meaning the two bulb types listed in these specifications are not interchangeable with each other.
The BMW M6 (2010) and the 2008 model year use the DE3423 festoon bulb for the map light position, while all other listed years use the 12961 T10 wedge bulb.
Model years 2006-2007, 2009, and 2012-2018 share the 12961 specification, indicating socket consistency across those years.
The wattage of the 12961 is specified at 5W, whereas no wattage value is provided for the DE3423 in these specifications.
The W2.1x9.5d base designation on the 12961 refers to a standardized IEC base code, where 2.1 denotes the wire contact width and 9.5 refers to the wedge length in millimeters.
The presence of two different bulb types across the M6 model range indicates that direct year-to-year substitution of map light bulbs is not reliable without confirming the specific model year first.