INFINITI M56 Map Light Bulb Size

The INFINITI M56 map light bulb uses 2 distinct sizes: 12961 and 89, with the bulb size varying by vehicle production year. The replacement chart covers 2011 through 2013 model years and specifies which bulb size corresponds to each year of manufacture.

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
2011-2013	12961 (Driver side and Passenger side)
2011-2013	89 (Front)

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The INFINITI M56 map light system uses two distinct bulb types across its positions: the 12961 for the driver and passenger sides, and the 89 for the front position.
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 89 is an ANSI-standard designation recognized in the US and Canada, featuring a single-filament design with a BA15s bayonet base, rated at 12V and 13W.
The BA15s bayonet base of the 89 bulb is a single-contact fitting, which is physically and electrically distinct from the wedge base of the 12961, making the two types non-interchangeable.
The 89 bulb is a lower-wattage variant of the 1156, sharing the same BA15s bayonet base but drawing less power, which means the 1156 is not a direct drop-in replacement for the 89 in this application.
At 13W, the 89 bulb draws significantly more power than the 5W 12961, reflecting the different roles each bulb serves within the map light assembly.
The W2.1x9.5d base designation of the 12961 refers to a wedge-type fitting where the glass envelope itself acts as the retention mechanism, requiring no separate locking hardware.
Both the 12961 and the 89 operate on a 12V circuit, consistent with standard automotive electrical systems.
The same bulb configuration applies across all three model years covered in the specifications, 2011-2013, with no variation in bulb size by position across those years.