Scion xA front inner turn signal and front turn signal bulbs use 7440 size, while rear turn signal bulbs use 7440NA or 7440 size. The replacement chart covers 2004 to 2006 model 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 Scion xA uses the 7440 bulb across all three turn signal positions for the 2004-2005 model years, making it the dominant bulb type in these specifications.
The 7440 is an ANSI-standardized single-filament wedge bulb in the T20 form factor, rated at 12 volts and 21 watts.
The T20 wedge base is a push-in connector type that does not use a separate metal base, which distinguishes it from bayonet-style automotive bulbs.
The 7440NA shares the same electrical ratings, base type, and ANSI classification as the standard 7440, with the sole physical difference being its natural amber glass envelope rather than clear glass.
In the 2006 Scion xA, the rear turn signal position specifies the 7440NA rather than the standard 7440 used in 2004-2005, indicating a factory shift to a bulb that produces amber light through the glass itself rather than relying solely on a colored lens.
Because the 7440 and 7440NA are electrically and physically identical, substituting a clear 7440 in a position specified for the 7440NA may affect the color output of the turn signal if the housing lens is clear or lightly tinted.
The front inner turn signal and front turn signal positions on the Scion xA share the same 7440 specification across all three model years covered, meaning both positions draw from the same bulb type.