INFINITI M37 Map Light Bulb Size

The INFINITI M37 map light requires bulb size 12961 and bulb size 89 for proper installation. Available data for the specified lighting components covers the range from 2011 to 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
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 M37 map light system uses two distinct bulb types across its model years: the 12961 for driver and passenger side positions, and the 89 for the front position.
Both bulb types appear across all three model years covered in the specifications, spanning 2011-2013, indicating a consistent lighting configuration throughout the M37's production run.
The 12961 is a Philips part number designation for a T10 miniature wedge bulb. It uses a W2.1x9.5d base and operates at 12V with a 5W output.
The T10 wedge base of the 12961 is a push-in style fitting, meaning it seats directly into a wedge socket without requiring rotation during installation or removal.
The 89 bulb follows the ANSI standard used in the United States and Canada. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W.
The BA15s bayonet base of the 89 bulb features a single locating pin, which distinguishes it from double-pin bayonet variants and makes it non-interchangeable with those types.
The 89 bulb is a lower wattage variant of the 1156. While the two share the same BA15s base type, the wattage difference means they are not direct substitutes for one another in applications where wattage tolerance is a factor.
The 12961 and 89 bulbs serve different socket positions within the same map light system and are not interchangeable with each other, as they use physically incompatible base types.