Toyota Highlander Trunk Bulb Size

The Toyota Highlander trunk utilizes 12961, DE3423, and DE3175 bulb sizes for the interior lighting components. Available data covers a range from 2001 through 2019 for the specified vehicle.

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
2016-2019	12961
2015	12961 (From 06/2015)
2015	DE3423 (To 06/2015)
2014	DE3423
2008-2013	DE3175
2001-2005	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, 41mm length, end-cap contacts. 12V.	DE3423
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The DE3175 festoon bulb is the most frequently specified trunk bulb across the Toyota Highlander's listed model years, appearing in the 2001-2008 and 2009-2010 ranges as well as 2012-2013. It is an ANSI-standard festoon type operating at 12V with a 31mm length and end-cap contacts.
The DE3423 is also an ANSI-standard festoon bulb operating at 12V, but its 41mm length makes it physically longer than the DE3175. These two festoon types are not interchangeable due to the difference in length, even though both share the same end-cap contact design and voltage rating.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. Unlike the festoon types used in earlier model years, it uses a wedge-style base rather than end-cap contacts, making it a fundamentally different bulb format.
The Toyota Highlander (2015) is a notable fitment case, as two different bulb sizes apply within the same model year. Vehicles produced up to June 2015 use the DE3423, while those produced from June 2015 onward use the 12961. Production date is therefore a required reference point for that year.
The transition from the DE3423 to the 12961 in mid-2015 represents a change not only in bulb size but in bulb format, moving from a festoon-style to a wedge-style base. These two types are not interchangeable.
From 2016-2019, the trunk bulb specification is consistent at the 12961, indicating a stable fitment across those model years with no mid-year variants noted.
All three bulb types listed across the Highlander's trunk specifications operate at 12V, which is standard for automotive interior lighting circuits. The wattage of the DE3423 and DE3175 is not specified in the provided data, while the 12961 is rated at 5W.
The end-cap contact design shared by both the DE3175 and DE3423 means the bulbs seat into holders at each end of the festoon housing. Despite this shared contact style, the length difference between the two prevents substitution of one for the other.