Suzuki SX4 Back Up Light Bulb Size

The Suzuki SX4 back up light requires a 7440 bulb size for the specific lighting component located at the rear of the vehicle. Data for the bulb specifications covers the range from 2007 through 2013.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2013	7440
2007	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

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Additional Notes

The 7440 is the sole bulb type listed across all model years of the Suzuki SX4 back up light specifications provided, covering 2007 and 2013.
The 7440 follows the ANSI standard applicable in the United States and Canada, meaning it conforms to a defined set of electrical and physical tolerances recognized across North American automotive applications.
The 7440 is a single-filament bulb, which is typical for back up lights since the function requires only one lighting state rather than the dual-intensity operation found in combination stop/tail bulbs.
The bulb operates at 12 volts and 21 watts, consistent with standard 12V automotive electrical systems and a moderate output level suited to reverse lighting.
The 7440 uses a T20 wedge base, a bayonet-free design where the bulb is held in place by the socket walls rather than pins or a locking collar.
The T20 wedge form factor is shared by several bulb variants, most notably the 7443, which is a dual-filament version. The 7440 and 7443 are not interchangeable in all applications due to the filament count difference, and substitution depends on socket wiring configuration.