The Lexus GX470 front turn signal requires a 1156NA bulb size, while rear turn signals use either 7440NA or 7440 bulb sizes. The replacement chart covers 2003 through 2009 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus GX470 uses two distinct bulb types across its turn signal positions: the 1156NA for the front and the 7440 or 7440NA for the rear, covering the full 2003-2009 model range.
The 1156NA is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base and natural amber glass, conforming to ANSI standards for the US and Canada markets.
The BA15s bayonet base of the 1156NA is a single-contact fitting, which means it is not interchangeable with dual-contact bayonet variants such as the 1157, despite sharing a similar physical form.
The 7440 and 7440NA are both single-filament T20 wedge bulbs rated at 12V and 21W, and the two share identical electrical characteristics under ANSI standards.
The distinction between the 7440 and 7440NA lies in the glass coating: the 7440NA carries natural amber glass, while the 7440 uses clear glass that relies on an amber-tinted lens housing to produce the required turn signal color.
The rear turn signal of the Lexus GX470 transitions from the standard 7440 to the 7440NA in the 2008-2009 model years, reflecting a shift to a bulb with a built-in amber tint rather than a tinted housing.
Because the 7440 and 7440NA share the same T20 wedge base and electrical ratings, the two are physically interchangeable, though substituting a clear 7440 where a 7440NA is specified may affect the output color if the lens housing is clear rather than amber-tinted.
The front turn signal position uses the 1156NA consistently across all 2003-2009 model years, indicating no change in bulb specification throughout the entire production run of the GX470.
Both the 1156NA and the 7440NA incorporate natural amber glass as a means of producing amber light output independent of the lens, a design approach that satisfies regulations in markets requiring amber-colored turn signals without relying solely on colored housings.
The single-filament design of all three bulb types used in the GX470 means these positions serve only the turn signal function and do not share a filament with any other lighting circuit such as a running light or brake light.