Mercedes-Benz ML450 Map Light Bulb Size

The Mercedes-Benz ML450 map light requires a unique bulb size identified as 12961 for the interior lighting system. Data for the specified component covers the range from 2010 to 2011.

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
2010-2011	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The Mercedes-Benz ML450 uses the 12961 bulb for the map light position across the 2010-2011 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base.
The W2.1x9.5d base is a wedge-type connection, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
The 12961 operates at 12 volts and 5 watts, which is consistent with low-current interior lighting applications such as map lights.
The T10 designation refers to the bulb's body size, where the number represents tenths of an inch across the widest point of the glass envelope.
The W2.1x9.5d base specification is standardized, meaning other T10 wedge bulbs sharing that base type are physically compatible with the same socket, though electrical ratings should match the original 12V, 5W output for proper function.