The Suzuki SX4 brake light utilizes a 7443 bulb size for illumination within the rear lighting assembly. Data for the specific bulb requirements covers the range from 2007 to 2013.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki SX4 brake light position uses the 7443 bulb for both the 2007 and 2013 model years.
The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W/5W output, and follows the ANSI standard applicable in the US and Canada.
Its dual-filament design allows a single bulb to serve two brightness levels, which is typical for combined stop and tail light functions.
The center high mount stop light position shows a bulb change between the 2007 and 2013 Suzuki SX4, with each year using a different bulb type.
The 2013 SX4 center high mount stop light uses the 921 bulb, a single-filament T15 wedge type rated at 12V and 16W, also under the ANSI standard.
The 2007 SX4 center high mount stop light uses the 12961, a Philips part number rather than an ANSI designation, indicating it is sourced through Philips' own product classification system.
The 12961 is a miniature T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, which places it at a significantly lower wattage than the 921 used in the 2013 model.
The T10, T15, and T20 designations refer to the bulb body width in eighths of an inch, meaning these three bulb types differ physically and are not interchangeable across positions.
The W2.1x9.5d base specification on the 12961 describes a wedge base with a 9.5mm pin spacing, a detail relevant to socket fitment.
Because the 2007 and 2013 center high mount stop light positions use physically distinct bulb types, substitution between model years without confirming socket compatibility would result in a fitment mismatch.