INFINITI Q70L Map Light Bulb Size

The INFINITI Q70L map light utilizes unique bulb sizes 89 and 12961 and DE3175 for illumination purposes. Data for the specified lighting components covers the range from 2015 to 2019.

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
2019	89 (Center)
2019	12961 (Side)
2017-2018	89 (Center)
2017-2018	DE3175 (Front)
2015-2016	89 (Center)
	12961 (Driver side and Passenger side)
	DE3175 (Front)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The bulb size 89 is an ANSI-standardized single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base. It serves as the center map light position across all model years of the Infiniti Q70L covered in these specifications, spanning 2015-2019.
The BA15s bayonet base on the 89 bulb is a single-contact variant, distinguishing it from the dual-contact BA15d base. This single-contact design is relevant when sourcing a replacement, as the two base types are not interchangeable despite their similar appearance.
The 89 bulb is a lower-wattage variant of the 1156 bulb. Although both share the BA15s base, the difference in wattage means the 1156 is not a direct substitute for the 89 in applications where the socket is rated for the lower 13W draw.
The DE3175 is an ANSI-standardized festoon bulb with a 31mm length and end-cap contacts operating at 12V. It appears in the front map light position on the Q70L for model years 2015-2018.
Festoon bulbs rely on spring tension between their end caps and the socket contacts rather than a keyed base, meaning the 31mm length of the DE3175 is a critical fitment factor. A festoon bulb of a different length will not make proper contact in a socket sized for the DE3175.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, using a W2.1x9.5d base and rated at 12V and 5W. It is specified for side map light positions on the Q70L.
For the 2019 Infiniti Q70L, the side map light position uses the 12961 bulb, while the 2018 model year does not list a side position with that bulb, instead carrying only the center 89 and front DE3175 entries.
The 2016 and 2015 model years each carry three distinct map light bulb sizes, covering center, driver side and passenger side, and front positions, making them the most varied fitment configurations within these specifications.
The W2.1x9.5d wedge base of the 12961 is a standardized T10 wedge interface. Wedge-base bulbs are held in place by the socket walls rather than a locking mechanism, so the T10 sizing must match the socket to ensure a secure fit.
The 89 and DE3175 are both governed by ANSI standards applicable in the United States and Canada, indicating that their physical and electrical parameters conform to a defined industry specification rather than being proprietary to a single manufacturer.