The Saturn Ion brake light requires a 3057 bulb size for proper installation and function. Data for the specified component covers the period from 2003 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn Ion uses the 3057 bulb for brake lighting across all model years from 2003-2007.
The 3057 is a dual-filament wedge bulb classified under the T25 form factor, operating at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament.
The dual-filament design of the 3057 allows a single bulb to serve both brake and tail light functions, with each filament handling a separate circuit.
The 3057 conforms to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and physical specifications across North American markets.
The center high mount stop light on the Saturn Ion uses the PC168 bulb across all model years from 2003-2007.
The PC168 is a miniature wedge bulb built on the T10 form factor and is fitted with a printed circuit board twist-lock socket, a mounting interface associated with instrument cluster and specialty lighting applications.
The PC168 also conforms to ANSI standards for the US and Canadian markets and operates at 12V.
The 3057 and PC168 are physically and electrically distinct bulb types, and the two positions they serve on the Saturn Ion are not interchangeable with each other.