The Suzuki SX4 turn signal requires a 7440NA bulb size for proper installation and function within the lighting assembly. Data for the specified component 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 7440NA is the sole bulb type listed across all turn signal positions in the Suzuki SX4 specifications provided, appearing in both the 2007 and 2013 model years.
The 7440NA follows the ANSI standard, which governs bulb specifications for the United States and Canada markets.
It is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as braking and signaling from a single unit.
The bulb uses a T20 wedge base, a pin-free fitting where the glass envelope itself locks into the socket by friction rather than by metal pins or a bayonet mechanism.
The natural amber glass of the 7440NA produces its amber color through the glass coating itself rather than through a clear bulb paired with an amber lens, which affects how the bulb interacts with the housing.
The 7440NA operates at 12 volts and 21 watts, values consistent with standard automotive electrical systems and typical turn signal power draw.
The Suzuki SX4 front and rear turn signals share the same 7440NA bulb specification, meaning the same bulb type fits all four turn signal positions on the vehicle.
The "NA" suffix in 7440NA distinguishes this variant from the standard 7440, which uses a clear glass envelope. Substituting a 7440 in place of a 7440NA would alter the color output at the lens.