Toyota Tacoma Dome Light Bulb Size

The Toyota Tacoma dome light utilizes bulb sizes 12961, DE3175, 578, and DE3022 depending on the specific version of the vehicle. Available data for the components spans from 1995 through 2023.

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
2021-2023	12961
2018	DE3175
2005-2015	578
2001-2004	DE3175
1998-2000	DE3022
1995-1997	DE3175

Bulb Specifications

Description	Bulb Size
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
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3022

Other Locations

Additional Notes

The Toyota Tacoma dome light draws from three bulb families across its model years: the T10 miniature wedge type (12961), and two festoon sizes at 31mm (DE3175 and DE3022) and 41mm (578).
The 578 is the most frequently specified bulb in these records, covering the 2005-2015 model years. It is a festoon type rated at 12V and 12W, with a 41mm length and end-cap contacts.
The DE3175 appears across multiple non-consecutive model year groups, including 1995-1997, 2001-2004, and 2018. It is a 31mm festoon bulb operating at 12V with end-cap contacts, conforming to the ANSI standard used in the US and Canada.
The 12961 is a Philips part number rather than an ANSI designation. It is a T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and is specified for the 2021-2023 Tacoma dome light position.
The DE3022 and DE3175 share the same 31mm festoon length and end-cap contact design, which can create confusion during replacement. Despite their physical similarity, they carry distinct part numbers and are not confirmed as interchangeable within these specifications.
The T10 wedge base of the 12961 is physically incompatible with the festoon-style sockets used in earlier Tacoma model years. The two bulb types require different socket designs and cannot be substituted for one another.
The 578 festoon at 41mm is longer than the DE3175 and DE3022 at 31mm. Installing a 41mm festoon into a socket sized for 31mm, or vice versa, would result in an improper fit.
The 1998-2000 model years are the only ones in these records specifying the DE3022, making it the least common bulb type listed across the Tacoma dome light fitment data.