Toyota Avalon dome light bulbs utilize 3 distinct sizes: 168, DE3423, and DE3175, while rear dome light applications require 12961 bulb size. The replacement chart covers vehicle production spanning 1995 to 2018 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Toyota Avalon dome light specifications cover model years 1995 through 2012, along with rear dome light data for 2017-2018.
The 168 bulb is the most frequently specified type across this data set, covering the Toyota Avalon dome light for 2005-2012. It is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 4.9W.
The DE3175 festoon bulb covers the Avalon dome light across 1995-2002. Festoon bulbs make contact at both ends via metal caps rather than a wedge base, and the DE3175 variant has a 31mm length.
The DE3423 festoon bulb is specified for 2003-2004. It shares the same end-cap contact design as the DE3175 but has a longer 41mm body, making the two types physically non-interchangeable despite both being ANSI-standard festoon bulbs.
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 is specified for the rear dome light position on the 2017-2018 Avalon.
The 168 and 12961 bulbs share the same T10 wedge form factor and nearly identical wattage ratings (4.9W and 5W respectively), though they are catalogued under different numbering systems, one being an ANSI code and the other a manufacturer part number.
Festoon bulbs of different lengths are not interchangeable. The DE3175 and DE3423 differ by 10mm in length, and installing the wrong length in a spring-loaded festoon socket can result in poor contact or physical incompatibility.
All four bulb types in these specifications operate on a 12V circuit, which is standard for automotive interior lighting in passenger vehicles.