The INFINITI G20 brake light utilizes 1157 and 7440 bulb sizes for the rear lighting system. Data for the specified vehicle components covers the period from 1991 through 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI G20 brake light specifications reference two distinct bulb types across its production years: the 7440 for 1999-2002 models and the 1157 for 1991-1996 models.
The 7440 is a single-filament T20 wedge bulb rated at 12V and 21W under the ANSI standard applicable in both the US and Canada.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, also rated at 12V but carrying a split wattage of 21W and 5W, reflecting its two-filament design for separate stop and tail light functions.
The BAY15d bayonet base of the 1157 is physically and electrically incompatible with the wedge socket used by the 7440, meaning the two bulb types are not interchangeable in brake light applications.
The center high mount stop light (CHMSL) on the INFINITI G20 follows a parallel split: 1999-2002 models use the 7440, while 1991-1996 models use the 912.
The 912 is a T15 wedge bulb rated at 12V and 12W, classified as a variant of the 921 under the ANSI standard.
Although the 7440 and 912 are both wedge-base bulbs, their wattage ratings differ significantly at 21W and 12W respectively, and they are not listed as interchangeable within these specifications.
For 1999-2002 models, the 7440 serves both the standard brake lights and the CHMSL, indicating a unified bulb type across those two positions in that generation.