INFINITI G20 Map Light Bulb Size

The INFINITI G20 map light requires bulb size 12961 or 89 for proper installation and function within the interior overhead lighting housing. Available data for the specified components covers the range from 1999 through 2002.

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
1999-2002	12961 (For Vehicle With Sunroof)
1999-2002	89 (For Vehicle Without Sunroof)

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

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Additional Notes

The INFINITI G20 map light bulb specifications cover the 1999-2002 model years, with two distinct bulb sizes listed depending on whether the vehicle is equipped with a sunroof.
Vehicles with a sunroof use the 12961 bulb, a Philips part number designating a miniature wedge-style T10 bulb with a W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge base is a push-in fitment that does not rotate to lock, meaning the bulb seats by friction alone within its socket.
Vehicles without a sunroof use the 89 bulb, an ANSI-standard single-filament type with a BA15s bayonet base, rated at 12V and 13W.
The BA15s bayonet base uses a twist-and-lock mechanism, which is physically incompatible with the W2.1x9.5d wedge socket used in sunroof-equipped trims.
The 89 bulb is a lower-wattage variant of the 1156, sharing the same BA15s base but drawing significantly less power at 13W compared to the 1156's 26.9W rating.
The 12961 and 89 bulbs are not interchangeable with each other, as they differ in both base type and wattage, making sunroof and non-sunroof fitments mutually exclusive.
The wattage difference between the two map light bulbs is notable: the 89 at 13W draws considerably more power than the 12961 at 5W, reflecting a difference in socket design between the two trim configurations.