Scion xB Turn Signal Bulb Size

Additional Notes

• The 7440NA and 7440 bulbs are both single-filament T20 wedge-base types rated at 12V and 21W. The NA designation indicates natural amber glass, whereas the standard 7440 uses clear glass. Both share the same wattage and base configuration.
• The 1157NA and 1034NA bulbs are dual-filament types with a BAY15d bayonet base, rated at 12V with a 21W/5W filament arrangement. The dual-filament design allows one bulb to serve both a running light and a turn signal function simultaneously.
• The "NA" suffix across all four bulb types denotes natural amber glass, which produces an amber signal color through the glass itself rather than through an amber-tinted lens or housing.
• For the Scion xB front turn signal, the 2008 model year uses the 1034NA, while the 2004-2006 and 2009-2010 model years use the 1157NA. The 1034NA is noted as a variant of the 1157, though the two are not listed as interchangeable within these specifications.
• The rear turn signal position transitions from the 7440NA in 2004-2006 to the standard 7440 in 2008-2010, then returns to the 7440NA for 2011-2015. Since both share the same T20 wedge base and 21W rating, the distinction lies solely in glass tint.
• The front turn signal position for 2011-2015 uses the 7440NA, representing a shift from the dual-filament BAY15d bulbs used in earlier model years to a single-filament wedge-base type.
• The front inner turn signal position, present only in 2004-2006, uses the 1034NA in 2004 and the 1157NA in 2005-2006. This position does not appear in later model years within these specifications.