The Cadillac Catera side marker utilizes a 194 bulb size for illumination across all recorded vehicle applications within the provided technical data. Information covers the period from 1997 through 2001 for the specified lighting component.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Cadillac Catera uses the 194 bulb for both its front and rear side markers across the full 1997-2001 production run.
The 194 is classified as a miniature wedge bulb, designated T10 in the international bulb sizing system, where "T" refers to the tubular shape and "10" indicates the width in eighths of an inch.
The 194 bulb operates at 12 volts with a power draw of 3.78 watts, placing it in the low-wattage range typical of side marker applications.
The T10 wedge base design means the bulb is held in its socket by the tension of the base itself rather than by a bayonet or screw mechanism, which is a common trait of marker and courtesy light applications.
The 194 carries an ANSI standard designation recognized in both the United States and Canada, indicating conformance to a shared North American specification for bulb geometry and electrical performance.
Because the Catera uses the same 194 bulb in all four side marker positions, front and rear units are interchangeable with one another from a bulb standpoint.
The T10 wedge format is shared by several bulb variants with differing wattages, so substitutions using physically compatible T10 bulbs of a different wattage rating would not conform to the factory 3.78W specification.