Toyota Sienna Tail Light Bulb Size

Additional Notes

• The 194 bulb is a miniature wedge type in the T10 form factor, rated at 12V and 3.78W under the ANSI standard. It serves as the inner tail light on the Toyota Sienna across the 2004-2012 model years, with the 2013 model year using it only through August 2013.
• The 168 bulb shares the same T10 miniature wedge form factor as the 194 but operates at a slightly higher wattage of 4.9W at 12V. Despite this physical similarity, the two bulbs are not interchangeable, as each is assigned to specific model years in the specifications.
• The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W high filament and a 5W low filament. This dual-filament design allows a single bulb to serve both brake and running light functions within one housing.
• The 1157 bulb is also a dual-filament type with the same 12V, 21W/5W rating as the 7443, but it uses a BAY15d bayonet base rather than a wedge base. Although both bulbs share identical wattage ratings, their base types are physically incompatible, making them non-interchangeable despite equivalent electrical output.
• The 2000 Toyota Sienna inner tail light has a production-date split, with vehicles built before August 2000 using the 1157 bulb and those built from August 2000 onward using the 7443. The same date-based distinction applies to the outer tail light for that model year.
• The outer tail light on the 2005 Sienna uses two different bulbs within the same model year, with one position taking a 7443 and another taking a 1157, indicating that separate sockets within the outer assembly have distinct requirements.
• The 2004 outer tail light assembly also uses two bulb types, with one position requiring a 1157 and another requiring a 168, further illustrating that multiple sockets within a single tail light housing can call for bulbs of different base types and wattages.
• All four bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, meaning the part numbers carry consistent electrical and physical specifications across both markets.