Chevrolet Corsica Seat Belt Warning Bulb Size

The Chevrolet Corsica seat belt warning light utilizes PC74, PC37, and 74 bulb sizes depending on the specific version of the component installed in the vehicle. Available data for the specified lighting components covers the period from 1987 through 1996.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1994-1996	PC74
1991-1993	PC37
1987-1990	74

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V, 1.4W.	PC74
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V.	PC37
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74

Other Locations

Additional Notes

The Chevrolet Corsica seat belt warning light uses three distinct bulb types across its production run: the 74, PC37, and PC74, all of which conform to ANSI standards recognized in both the United States and Canada.
All three bulb types share the T5 miniature wedge form factor, which refers to a tubular bulb body approximately 5/8 of an inch wide with a wedge-shaped base that friction-fits directly into its socket without a separate bulb holder.
The 74 bulb was fitted to the 1987-1990 model years and operates at 12V with a rated wattage of 1.4W. It uses a standard T5 wedge base without any printed circuit board interface.
The PC37 replaced the 74 in the 1991-1993 model years. It retains the T5 wedge body and 12V operating voltage but adds a printed circuit board twist-lock socket, which is designed specifically for instrument cluster panel integration.
The PC74 was used in the 1994-1996 model years and shares the same 12V, 1.4W electrical rating as the 74, while also incorporating the printed circuit board twist-lock socket introduced with the PC37.
The "PC" designation in PC37 and PC74 denotes compatibility with printed circuit board sockets. These sockets lock into the circuit board with a twist motion, making them physically incompatible with the plain wedge socket used by the 74 bulb, despite the shared T5 body shape.
The 74 and PC74 share identical electrical characteristics at 12V and 1.4W, but their socket types differ. Substituting one for the other is not supported by the specifications due to the socket interface difference.
The PC37 does not have a listed wattage rating in the specifications, whereas both the 74 and PC74 are rated at 1.4W. This distinction is relevant when assessing electrical load in the instrument cluster circuit.