The Acura TSX brake light uses a 7443 bulb size for the rear lighting system. Data for the specified component covers the period from 2004 through 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura TSX uses the 7443 bulb for its brake lights across the full 2004-2010 model range.
The 7443 is a dual-filament wedge bulb classified under the T20 form factor, rated at 12V with a wattage split of 21W for the high-intensity filament and 5W for the low-intensity filament.
The dual-filament design of the 7443 allows a single bulb to serve two lighting functions simultaneously, typically stop and tail light operation, within one housing.
The Center High Mount Stop Light on the Acura TSX uses the 7440 bulb across the same 2004-2010 model range.
The 7440 is a single-filament wedge bulb, also in the T20 form factor, rated at 12V and 21W.
Both the 7443 and 7440 conform to ANSI standards applicable in the United States and Canada.
Although the 7443 and 7440 share the same T20 wedge form factor and voltage rating, they are not interchangeable. The 7443 carries two filaments while the 7440 carries one, and substituting one for the other would result in incorrect or non-functional lighting behavior.
The 7440 in the Center High Mount Stop Light position operates at a full 21W with no secondary filament, as that position requires only a single stop light function.