The Toyota Sienna brake light utilizes 7443, P21/5W, and 1157 bulb sizes depending on the specific version of the vehicle. Available data for the lighting components covers the range from 1998 through 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 and 1157 bulb types appear across the brake light positions in the Toyota Sienna specifications. Both are dual-filament bulbs rated at 12V with a 21W/5W output, where the higher wattage filament activates for braking and the lower wattage filament serves a secondary function such as a tail light. Despite sharing identical electrical ratings, the two types differ in their base design: the 7443 uses a T20 wedge base, while the 1157 uses a BAY15d bayonet base. These two base types are physically incompatible with each other.
The 921 bulb is a single-filament T15 wedge type rated at 12V and 16W. It is specified exclusively for the Center High Mount Stop Light on the Toyota Sienna for model years 1998-2003. Because it carries only one filament, it functions solely as a stop light rather than a combined stop and tail light.
The Toyota Sienna (2000) presents a mid-year production change in both the Inner Brake and Outer Brake positions. Units produced from August 2000 onward use the 7443 wedge bulb, while earlier 2000 production units use the 1157 bayonet bulb. Confirming the exact production date of a specific vehicle is necessary before selecting a replacement bulb for that model year.
A similar mid-year transition is recorded for the 2006 and 2007 model years in the Outer Brake position. The 2006 Sienna used the 1157 bulb up to September 2005 and switched to the 7443 from that date onward. The 2007 model year continued with the 7443 from December 2006.
The 2005 Toyota Sienna shows a split between brake light positions. The general brake light specification lists the 1157, while the Outer Brake position for that year also lists the 1157. The Inner Brake position for 2005 is not listed separately, as the Inner Brake sub-part entries end at the 2003 model year.
For model years 2001-2003, the Toyota Sienna carried three distinct brake bulb positions: a general brake position using the 7443, an Inner Brake position also using the 7443, and a Center High Mount Stop Light using the 921. This indicates a three-position brake lighting arrangement during that period.
The 7443 is the predominant bulb type across the Sienna brake light specifications, appearing in the general brake, Inner Brake, and Outer Brake positions across the widest range of model years. The 1157 is concentrated in earlier production years and in certain mid-cycle production windows of later model years.
Both the 7443 and 1157 conform to ANSI standards applicable in the United States and Canada, as noted in the specifications. The 921 also carries the same ANSI regional designation. All three bulbs operate on a 12V electrical system, consistent with standard automotive electrical architecture.