Freightliner Coronado front turn signal bulb size 3157NA and rear turn signal bulb size 1157 are specified in this replacement chart. The chart covers vehicle production years spanning 2012 to 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Freightliner Coronado uses two distinct bulb types across its turn signal positions for the 2012-2018 model years: the 3157NA for the front and the 1157 for the rear.
The 3157NA is a dual-filament T25 wedge bulb with natural amber glass, rated at 12V and drawing 27W on the high filament and 7W on the low filament. The amber tint is built into the glass itself rather than applied as a coating.
The 1157 is a dual-filament bulb fitted with a BAY15d bayonet base, rated at 12V and drawing 21W on the high filament and 5W on the low filament. The BAY15d base uses two pins offset at different heights to prevent incorrect installation.
Both bulb types conform to ANSI standards recognized in the United States and Canada, meaning they meet a defined set of electrical and physical tolerances rather than being proprietary specifications.
The dual-filament design in both bulbs allows a single unit to serve two lighting functions, typically combining turn signal output with a lower-intensity running or parking light on the same circuit.
The 3157NA and 1157 use different base types and are not interchangeable with each other. The 3157NA uses a wedge-style base while the 1157 uses a bayonet-style base, making socket compatibility a determining factor in fitment.
The natural amber glass of the 3157NA produces a filtered amber output without relying on a colored lens, which affects how the bulb performs if placed in a clear or differently tinted housing.
The higher wattage of the 3157NA front filament (27W) compared to the 1157 rear filament (21W) reflects a difference in designed output intensity between the two positions.