The Acura ZDX front turn signal bulb size measures 3457NA or 3357NA, while the rear turn signal bulb size measures 7440 for this model. The replacement chart covers 2010 through 2013 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura ZDX front turn signal uses the 3457NA bulb for the 2011-2013 model years and the 3357NA bulb for the 2010 model year.
The 3457NA is a dual-filament T25 wedge bulb rated at 12V with a 27W main filament and a 7W secondary filament, finished in natural amber glass to an ANSI standard recognized in the US and Canada.
The 3357NA shares the same T25 wedge form, natural amber glass, and 12V/27W rating as the 3457NA but carries only a single filament, making the two bulbs physically similar yet functionally distinct.
Because the 3457NA and 3357NA share the T25 wedge base, they are physically interchangeable in the socket, but substituting a single-filament 3357NA where a dual-filament 3457NA is specified would result in the loss of one lighting function.
The rear turn signal of the Acura ZDX uses the 7440 bulb across all four model years covered, 2010-2013.
The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W, also conforming to the ANSI standard for the US and Canadian markets.
The T20 wedge base of the 7440 is a different size than the T25 base used by the 3457NA and 3357NA, meaning front and rear turn signal bulbs on the ZDX are not interchangeable with each other.
All three bulb types specified for the ZDX conform to ANSI standards applicable in the US and Canada, indicating they are designed for North American market vehicles.
The natural amber glass of the 3457NA and 3357NA produces a colored output directly from the bulb itself, a characteristic associated with housings that use clear or non-tinted lenses for the turn signal function.