Toyota Avalon Stepwell Bulb Size

Additional Notes

• The Toyota Avalon stepwell position uses three distinct bulb types across its model history: the 168, the DE3423, and the 194.
• The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W, conforming to ANSI standards for the US and Canada markets. It fits the Toyota Avalon stepwell for model years 2005-2019.
• The 194 bulb is also a T10 miniature wedge type, sharing the same 12V operating voltage as the 168 but rated at a lower 3.78W. It fits the 1995-1999 Avalon stepwell.
• Although the 168 and 194 bulbs share the same T10 wedge base form factor, they carry different wattage ratings, which means they are not identical units despite their physical similarities.
• The DE3423 is a festoon-style bulb with a 41mm length and end-cap contacts, operating at 12V. This type differs fundamentally in its mounting style from the wedge-base 168 and 194 bulbs, as festoon bulbs seat between two spring clips rather than into a wedge socket.
• The Toyota Avalon (2000-2004) stepwell uses the DE3423 festoon bulb, representing a distinct fitment generation between the earlier 194 wedge years and the later 168 wedge years.
• Because the DE3423 festoon bulb uses end-cap contacts and a 41mm cylindrical body, it is not interchangeable with either the 168 or 194 wedge bulbs, which require a completely different socket type.
• All three bulb types listed for the Avalon stepwell conform to ANSI standards applicable to the US and Canadian markets.