Hyundai XG350 Turn Signal Bulb Size

Additional Notes

• The front turn signal position on the Hyundai XG350 uses the 2357NA bulb for the 2004-2005 model years and the 2357 bulb for the 2002-2003 model years, while the rear turn signal position uses the 1156NA bulb across all four model years covered by these specifications.
• The 2357 and 2357NA are both dual-filament bulbs sharing the BAY15d bayonet base, operating at 12V with a wattage split of 26.9W on the high filament and 8W on the low filament. The 2357NA variant adds a natural amber glass coating, which produces the amber turn signal color directly from the bulb rather than relying on a colored lens.
• The 2357 is noted as a brighter variant of the 1157, meaning it shares the same BAY15d base and general form factor but draws more power on its high filament. This relationship indicates the 2357 and 1157 occupy the same bulb family, though they are not identical in output.
• The 1156NA used in the rear turn signal position is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. The single-filament design means it serves a dedicated function, in this case turn signaling, rather than a combined stop-and-tail role.
• The BAY15d base on the 2357 and 2357NA features two offset locating pins, which physically prevents incorrect installation of a single-filament bulb in a dual-filament socket. The BA15s base on the 1156NA has a single pin and is not interchangeable with BAY15d sockets.
• Substituting a 2357 for a 2357NA in the 2004-2005 front turn signal position, or vice versa, involves a difference in glass coating rather than base type or wattage, since both bulbs share the same electrical ratings and BAY15d base. Whether the amber color requirement is met depends on the lens color of the housing in that application.