Nissan Armada Stepwell Bulb Size

The Nissan Armada stepwell light uses 12961, 74, and 158 bulb sizes depending on the specific version of the vehicle. Available data covers a range from 2005 through 2022.

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
2021-2022	12961
2017-2020	74
2005-2015	158

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	158

Other Locations

Additional Notes

The Nissan Armada stepwell uses three distinct bulb types across its model years: the 158, 74, and 12961. The 158 is the most widely used, covering 2005-2015, which represents the majority of model years in these specifications.
The 158 is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 3W. Its standardized designation makes it broadly available across multiple manufacturers and suppliers.
The 74 is an ANSI-standard miniature wedge bulb in a T5 form factor, rated at 12V and 1.4W. It is the lower-wattage option among the three bulb types listed and fits the 2017-2020 Armada stepwell position.
The 12961 is a Philips part number rather than an ANSI industry code. It designates a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and applies to the 2021-2022 Armada.
Although both the 158 and the 12961 share the T10 form factor, their wattage ratings differ at 3W and 5W respectively, and the 12961 carries a manufacturer-specific designation rather than a universal ANSI code.
The T5 form factor of the 74 bulb is physically smaller than the T10 form factor used by both the 158 and the 12961. These size differences indicate the bulb types are not interchangeable across the 2005-2015, 2017-2020, and 2021-2022 model year groups.
The W2.1x9.5d base specification on the 12961 refers to a wedge-type base with a 9.5mm pin spacing, which is a standard dimension for T10 wedge bulbs and is consistent with the physical base shared by the 158.