Toyota Corolla Instrument Panel Bulb Size

Additional Notes

• The bulb size 74 is the most frequently specified instrument panel bulb across the Toyota Corolla data, appearing in model years 2007-2013, as well as 1982-1987, 1992, 1994, and 1996. It is an ANSI-standard miniature wedge bulb in the T5 form factor, rated at 12V and 1.4W.
• The bulb size 194 is the second most common specification, covering model years 1968-1981 and 1993. It is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W.
• The bulb size 158 is specified for the Toyota Corolla in 1995 and 1997. Like the 194, it uses a T10 miniature wedge form factor and operates at 12V, though it draws a lower wattage of 3W.
• Although the 158 and 194 share the same T10 wedge base and voltage rating, their wattage values differ. The 194 draws 3.78W while the 158 draws 3W, which means the two are not electrically identical despite their physical similarities.
• The T5 wedge base of the 74 bulb is physically smaller than the T10 base used by both the 158 and 194. A T10-based bulb cannot be substituted into a socket designed for a T5, as the base widths are incompatible.
• The specifications for 1995 and 1997 call for the 158 rather than the 74 or 194 used in adjacent years, indicating that the instrument panel socket specification for the Toyota Corolla was not uniform across all model years of the same generation.
• All three bulb types listed in the specifications, the 74, 158, and 194, conform to ANSI standards applicable in both the United States and Canada, and all operate on a 12V electrical system.
• The wedge base design common to all three bulb types means the bulb is held in its socket by the tension of the base contacts rather than by a separate locking mechanism, which is a standard characteristic of miniature wedge bulbs used in instrument panel applications.