Suzuki XL-7 Back Up Light Bulb Size

The Suzuki XL-7 back up light utilizes 921 and 7440 bulb sizes for the lighting components. Data for the specific bulb requirements covers the range from 2002 to 2009.

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
2007-2009	921
2002-2006	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

Other Locations

Additional Notes

The Suzuki XL-7 back up light specifications cover model years 2002-2009 and reference two distinct bulb sizes across that span: the 921 and the 7440.
The 921 bulb is the specified size for the 2007-2009 Suzuki XL-7, while the 7440 is specified for the 2002-2006 model years, indicating a change in bulb fitment between the 2006 and 2007 model years.
Both the 921 and 7440 are ANSI-standard bulbs recognized in the US and Canada, meaning they conform to a defined set of dimensional and electrical standards within those markets.
The 921 is a T15 wedge bulb, where T15 refers to the tubular bulb shape with a width of 15 eighths of an inch. It operates at 12 volts and draws 16 watts.
The 7440 is a T20 wedge bulb, a larger tubular form factor than the T15, and is rated at 12 volts with a higher wattage of 21 watts.
Both bulbs use a wedge-style base, which is a baseless design where the glass envelope itself is pinched to form the electrical contacts, eliminating the need for a separate metal base.
The 7440 is specified as a single-filament bulb, meaning it serves one lighting function only, which is consistent with its application as a dedicated back up light.
The 921 and 7440 are not interchangeable. Despite both being wedge-type bulbs, they differ in physical size (T15 vs. T20) and wattage (16W vs. 21W), making cross-substitution incompatible with the housing and electrical circuit of each respective model year.