The INFINITI M30 front and rear turn signal bulbs both utilize a 1157 size bulb for proper operation. Replacement chart data spans 1990 to 1992 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 1157 is the sole bulb type specified for the INFINITI M30 across all listed turn signal positions and model years.
The 1157 is an ANSI-standard bulb recognized in both the United States and Canada, making it a widely available replacement type.
As a dual-filament bulb, the 1157 operates two separate filaments within a single envelope, with the higher-wattage filament handling the turn signal function and the lower-wattage filament serving a secondary role such as parking or running light duty.
The 1157 operates at 12 volts with a wattage rating of 21W for the primary filament and 5W for the secondary filament.
The 1157 uses a BAY15d bayonet base, which is an offset twin-contact base. The offset pin configuration is a deliberate anti-rotation feature that ensures the bulb is seated in only one orientation, aligning each filament with its intended circuit contact.
The INFINITI M30 (1990-1992) uses the same 1157 bulb specification for both the front and rear turn signals across all three model years covered in the specifications.
Because the front and rear turn signal positions share an identical bulb specification, a single 1157 bulb serves as a direct fitment for either location on the M30.
The BAY15d base of the 1157 is not interchangeable with single-filament bayonet bases such as the BA15s, as those lack the second contact pin required to power a dual-filament bulb.