Chevrolet Corsica Instrument Panel Bulb Size

Additional Notes

• The Chevrolet Corsica instrument panel draws from two primary wedge bulb envelope sizes across its model years: the T5, a smaller tubular wedge form, and the T10, a wider tubular wedge form. T5 bulbs appear in lower-wattage applications, while T10 bulbs carry higher wattage ratings.
• The T10 envelope is shared by three distinct bulb types used in the Corsica instrument panel: the 168, the 194, and the PC194. Although the 168 and 194 share the same envelope size and voltage rating of 12V, they differ in wattage, with the 168 rated at 4.9W and the 194 rated at 3.78W, making them non-interchangeable despite their physical similarity.
• The PC194 is a T10 wedge bulb rated at 12V and 3.78W, matching the 194 in both envelope size and wattage. However, the PC194 incorporates a printed circuit board twist-lock socket, a mounting interface designed specifically for direct integration into printed circuit board instrument clusters rather than conventional bulb sockets.
• The T5 envelope is represented by the 37, the 74, and the PC74 in the Corsica specifications. The 37 is rated at 1W, while both the 74 and PC74 are rated at 1.4W. The wattage difference between the 37 and the other T5 types indicates they are not interchangeable despite sharing the same envelope size.
• The PC74 is a T5 wedge bulb rated at 12V and 1.4W, identical in wattage to the standard 74. Like the PC194, the PC74 uses a printed circuit board twist-lock socket, distinguishing it from the conventional 74 in terms of socket compatibility.
• All six bulb types in the Corsica instrument panel specifications conform to ANSI standards recognized in both the United States and Canada, indicating a standardized electrical and physical specification across the listed part numbers.
• The Chevrolet Corsica (1996) uses the PC74, and the 1991 model year uses the standard 74. Both are T5 wedge bulbs at 1.4W and 12V, but the PC74 requires a twist-lock printed circuit board socket while the 74 uses a conventional socket, making them incompatible as direct replacements for one another.
• The 1995 and 1993 model years share the PC194 specification, while the 1990, 1988, and 1987 model years share the 194 specification. The socket type differs between these two groups, as the PC194 is designed for printed circuit board mounting and the 194 is not.
• The 1989 and 1992 model years both specify the 168 bulb, a T10 wedge rated at 4.9W. This wattage is higher than that of the 194 and PC194, both of which are also T10 wedge types, reinforcing that envelope size alone does not determine interchangeability.
• The 1994 model year specifies the 37 bulb, a T5 wedge rated at 1W. This is the lowest wattage among all bulb types listed in the Corsica instrument panel specifications and is the only year assigned this particular bulb number.