Toyota Sienna Courtesy Bulb Size

The Toyota Sienna courtesy light uses bulb sizes 168, 12961, DE3423, 194, and DE3175 across various production versions. Available information covers a span of time starting from 1998 through 2024.

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
2024	168
2023	12961
2018	168
2011-2014	168
2010	DE3423
2004-2009	194
2003	DE3175
2000-2002	194
1999	DE3175
1998	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The 194 bulb is the most frequently specified courtesy bulb size across the Toyota Sienna's model history, appearing in nine of the listed model years spanning 1998-2009, with the exception of 1999 and 2003. It is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards for the US and Canadian markets.
The 168 bulb shares the same T10 miniature wedge form factor as the 194 but operates at a slightly higher wattage of 4.9W. It is also an ANSI-standard bulb and appears across multiple model years including 2011-2014, 2018, and 2024.
Although the 168 and 194 bulbs share the same T10 wedge base type, their wattage ratings differ at 4.9W and 3.78W respectively. This distinction is relevant to fitment, as substituting one for the other may affect electrical load and light output in the Toyota Sienna's courtesy circuit.
The 2023 Toyota Sienna specifies the 12961, a Philips part number rather than an ANSI standard designation. It is a T10 miniature wedge bulb with a W2.1x9.5d base rated at 12V and 5W, making it the highest-wattage T10-type bulb listed across all model years in these specifications.
Two festoon-type bulbs appear in the specifications: the DE3423 and the DE3175. Both use end-cap contacts and operate at 12V, but they differ in length, with the DE3423 measuring 41mm and the DE3175 measuring 31mm. These two bulbs are not interchangeable due to their differing lengths.
The DE3175 festoon bulb is specified for the 1999 and 2003 model years, while the DE3423 is specified for 2010. The physical length difference between these festoon types means the housing socket determines which is compatible, and cross-substitution between them is not supported by these specifications.
The courtesy bulb type for the Toyota Sienna changes across its model history, with festoon-type bulbs appearing in isolated years among otherwise wedge-type specifications. This indicates that the courtesy light housing design was not consistent across all generations covered by these specifications.