The Suzuki Grand Vitara turn signal utilizes 7440NA and PY21W bulb sizes for the lighting components. Information provided covers the specific time period from 1999 through 2013 for the listed vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440NA is the most frequently specified bulb across the Suzuki Grand Vitara turn signal positions covered in these specifications. It appears in both the front and rear turn signal roles across the 2006-2013 model years, as well as all rear turn signal positions from 1999 onward.
The 7440NA is a single-filament wedge bulb following the T20 form factor, rated at 12V and 21W. Its natural amber glass produces the required turn signal color without relying on a tinted lens or housing.
The PY21W is specified for the front turn signal position on the Suzuki Grand Vitara for model years 1999-2005. It is a single-filament bulb rated at 12V and 21W, using a BAU15s offset bayonet base.
The BAU15s base of the PY21W is offset, meaning the two pins are positioned at unequal heights. This prevents the bulb from being seated in sockets designed for a standard BA15s base, making it non-interchangeable with many other common automotive bulbs.
Although the 7440NA and PY21W share the same voltage and wattage ratings of 12V and 21W, their base types are entirely different. The 7440NA uses a wedge base while the PY21W uses a BAU15s bayonet base, so the two bulbs are not physically interchangeable.
The 7440NA follows the ANSI standard used in the United States and Canada, while the PY21W follows the ECE standard used in Europe and other international markets. This distinction reflects a regional difference in socket and base design conventions.
The front turn signal socket on the Grand Vitara changed between the 2005 and 2006 model years, shifting from the PY21W to the 7440NA. The rear turn signal socket used the 7440NA throughout the entire 1999-2013 span covered in these specifications, with no equivalent change.
Because the front and rear turn signals share the same 7440NA bulb on the 2006-2013 Grand Vitara, both positions draw the same wattage load. This uniformity can be relevant when assessing compatibility with electronic flasher relays sensitive to circuit load.