Suzuki Vitara Back Up Light Bulb Size

The Suzuki Vitara back up light utilizes 921 and 7440 bulb sizes for the rear illumination system. Data for the specific lighting components covers the period from 1999 through 2004.

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
2001-2004	921
1999-2000	7440

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

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Additional Notes

The Suzuki Vitara uses two distinct bulb sizes for the back up light across its model years: the 921 and the 7440.
The 921 bulb is the specified back up light size for the 2001-2004 Suzuki Vitara.
The 7440 bulb is the specified back up light size for the 1999-2000 Suzuki Vitara.
The 921 is a T15 wedge bulb rated at 12V and 16W, conforming to ANSI standards applicable in the US and Canada.
The 7440 is a T20 single-filament wedge bulb rated at 12V and 21W, also conforming to ANSI standards applicable in the US and Canada.
The 7440 draws 21W compared to the 921's 16W, meaning the two bulbs are not electrically equivalent and are not interchangeable without consideration of wattage differences.
Both the T15 and T20 designations refer to wedge-base bulb families, though they differ in physical size, which further prevents direct interchangeability between the 921 and 7440.
The change in bulb specification between the 2000 and 2001 model years reflects a shift from the T20 form factor to the smaller T15 form factor in the Vitara's back up light assembly.