Saturn Outlook front and rear turn signal bulbs utilize 12272NA and 3157 sizes respectively. Replacement chart data spans 2007 to 2010 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn Outlook uses two distinct bulb types across its front and rear turn signal positions for the 2007-2010 model years.
The front turn signal on the Saturn Outlook calls for the 12272NA across all four model years covered in the specifications.
The 12272NA is an OEM part number rather than an ANSI industry-standard designation, identifying it as a manufacturer-specific component with a natural amber glass construction operating at 12V.
Natural amber glass produces the amber color required for turn signals through the glass itself rather than through a colored lens or coating, which is a characteristic of the NA suffix in the part designation.
The rear turn signal position uses the 3157 bulb for the 2007-2010 model years, a designation governed by ANSI standards applicable in both the United States and Canada.
The 3157 is a dual-filament bulb in a T25 wedge form factor, operating at 12V with a 27W high filament and a 7W low filament, allowing it to serve both a bright signaling function and a reduced-intensity running or parking function within a single housing.
Because the front position uses a manufacturer-specific OEM number and the rear uses a standardized ANSI designation, the two bulb types are not interchangeable with each other despite both operating at 12V.
The T25 wedge base of the 3157 is a push-in connector type, which is physically incompatible with sockets designed for other base configurations such as bayonet or indexed bases.