The INFINITI J30 brake light utilizes a specific 1157 bulb size for illumination within the rear housing assembly. Data for the specified component covers the period from 1993 through 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI J30 uses the 1157 bulb for brake lighting across all model years from 1993-1997. This bulb follows the ANSI standard applicable in both the US and Canada.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit. In brake light applications, the higher-wattage filament at 21W activates under braking, while the 5W filament typically handles the running light function.
The 1157 uses a BAY15d bayonet base, which is an offset dual-contact base. The offset pin placement is a deliberate design feature that prevents incorrect insertion of single-filament bulbs into dual-filament sockets.
The center high mount stop light on the J30 uses a T15 wedge bulb, though the specific size varies by model year. The 1993-1994 J30 takes a 921 bulb, while the 1995-1997 J30 takes a 922 bulb.
The 921 and 922 are both T15 wedge-base bulbs rated at 12V and 16W under ANSI standards. Because they share the same physical base type and wattage rating, they are closely related bulbs, though they are listed as distinct part numbers for specific model years of the J30.
The wedge base on the 921 and 922 bulbs relies on the wire leads of the bulb itself to make electrical contact, with no separate metal base component. This differs from the bayonet base design used by the 1157.
The 1157 operates at 12V, consistent with the standard electrical system voltage found in conventional passenger vehicles of the J30's era.