Toyota Avalon Courtesy Bulb Size

Additional Notes

• The Toyota Avalon courtesy bulb specifications cover three distinct bulb types across the 1995-2021 model years: the 168, the DE3423, and the 194.
• The 168 bulb is the most widely used type in these specifications, fitted to the Avalon from 2005 through 2021, with the exception of 2020.
• The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, conforming to ANSI standards for the US and Canadian markets.
• The 194 bulb is also a T10 miniature wedge type, rated at 12V and 3.78W under the same ANSI standard, making it physically similar to the 168 but with a lower wattage output.
• Although the 168 and 194 share the T10 wedge form factor, their wattage ratings differ, and substituting one for the other without confirming vehicle-specific requirements carries a risk of incorrect light output.
• The Toyota Avalon (1995-1999) uses the 194 bulb for its courtesy lighting.
• The DE3423 is a festoon-type bulb with a 41mm length and end-cap contacts, operating at 12V, and represents a physically distinct design from the wedge-type 168 and 194 bulbs.
• The Toyota Avalon (2000-2004) uses the DE3423 festoon bulb, which is not interchangeable with the wedge-base types used in other model years due to its different contact design and mounting style.
• All three bulb types listed in these specifications conform to ANSI standards applicable to the US and Canadian markets.
• The shift from the 194 wedge bulb to the DE3423 festoon bulb between the 1999 and 2000 model years, and then from the DE3423 to the 168 wedge bulb between the 2004 and 2005 model years, reflects two separate changes in courtesy bulb fitment across the Avalon's generational updates.