The INFINITI I30 front turn signal bulb uses 7440 or 1157 size, while the rear turn signal bulb uses 7440 or 1156 size. The replacement chart covers 1996 through 2001 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI I30 uses two distinct bulb types across its model years: the 7440 for 2000-2001 and either the 1157 or 1156 for 1996-1999, depending on the position.
The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and conforms to ANSI standards applicable in the US and Canada.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W main filament and a 5W secondary filament, also conforming to ANSI standards.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and likewise conforms to ANSI standards for the US and Canadian markets.
The front and rear turn signals on the INFINITI I30 share the same bulb type within each model year grouping, with both positions using the 7440 in 2000-2001 and diverging to the 1157 (front) and 1156 (rear) in 1996-1999.
The 1157 and 1156 both use bayonet-style bases, but their base types differ. The BAY15d base of the 1157 has offset pins to accommodate its dual-filament design, while the BA15s base of the 1156 has a single contact and is not interchangeable with the 1157.
Although the 1156 and 1157 share the same 21W operating wattage on their primary filament, the additional 5W filament in the 1157 means the two bulbs serve different circuit configurations and are not substitutes for one another.
The 7440 wedge base is physically and electrically incompatible with the bayonet bases used by the 1156 and 1157, making cross-year substitution between the 1996-1999 and 2000-2001 model years unsuitable without socket modification.