Toyota Tundra Dome Light Bulb Size

The Toyota Tundra dome light uses bulb sizes 168, DE3425, and DE3175 across various production periods. Available information covers a specific range of time starting in 2000 and ending in 2020.

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
2018-2020	168
2007-2013	168
2005-2006	DE3425
2000-2004	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3425
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Toyota Tundra dome light uses three distinct bulb types across its model years: the 168 (T10 wedge), the DE3425 (41mm festoon), and the DE3175 (31mm festoon), all of which conform to ANSI standards recognized in the United States and Canada.
The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W. Its wedge base design means it is held in place by the socket itself rather than by pins or end caps, which distinguishes it from festoon-style bulbs.
The DE3425 and DE3175 are both festoon bulbs, meaning they make electrical contact through metal caps at each end of the cylindrical glass tube. The key difference between them is physical length: the DE3425 measures 41mm while the DE3175 measures 31mm.
Because the DE3425 and DE3175 share the same festoon contact style but differ in length, they are not interchangeable. Installing a festoon bulb of the wrong length will result in poor contact or no contact within the holder.
The Toyota Tundra (2007-2020) uses the 168 T10 wedge bulb for the dome light, making it the most widely specified bulb type across the listed model years.
The 2005-2006 Tundra uses the DE3425 festoon bulb, while the 2000-2004 Tundra uses the shorter DE3175 festoon bulb, indicating a change in dome light holder design between the 2004 and 2005 model years.
A further change in dome light bulb type occurred between the 2006 and 2007 model years, when the specification shifted from the DE3425 festoon to the 168 T10 wedge, reflecting a different socket design in the updated Tundra.
All three bulb types listed operate on a 12V electrical system, consistent with standard automotive voltage, though only the 168 has a wattage rating of 4.9W specified in the provided data.