Kia Seltos Tail Light Bulb Size

Additional Notes

• The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit. One filament operates at 21W for brighter output, typically used for stop or turn signals, while the second filament runs at 5W for lower-intensity functions such as running or parking lights.
• The 1157 uses a BAY15d bayonet base, which features two offset pins positioned at different heights on the base. This asymmetric pin arrangement prevents incorrect insertion, ensuring the two filaments are connected to their correct circuits.
• The 1157 designation follows ANSI standardization, meaning the bulb conforms to a defined specification recognized across the United States and Canada. This standardization allows for consistent interchangeability among bulbs carrying the same designation from different manufacturers.
• The Kia Seltos uses the 1157 bulb for its tail lights across the 2023-2024 model years. Both years share the same bulb specification, indicating no change in tail light bulb fitment between these two model years.
• The 1157 operates at 12V, which is consistent with standard 12-volt automotive electrical systems. Substituting a bulb rated for a different voltage would affect both brightness and service life.