Toyota Corona Brake Bulb Size

Additional Notes

• The Toyota Corona uses the 1157 bulb for the brake light position across all listed model years, spanning 1969-1982.
• The 1157 is an ANSI-standardized bulb type, meaning it conforms to a defined specification recognized across the United States and Canada, ensuring consistent physical and electrical properties between manufacturers.
• The 1157 is a dual-filament bulb, which allows it to serve two brightness levels within a single housing. In brake light applications, the higher-output filament activates under braking while the lower-output filament typically handles a secondary function such as running lights.
• The bulb operates at 12 volts with a wattage rating of 21W on the primary filament and 5W on the secondary filament, reflecting the power draw associated with each filament's respective function.
• The 1157 uses a BAY15d bayonet base, a two-pin offset base design. The offset pin placement is a deliberate fitment control, as it prevents the bulb from being inserted in the wrong orientation, which would reverse the filament functions.
• Because the BAY15d base uses offset pins, it is not physically interchangeable with single-filament bayonet bulbs that share a similar base style, such as those using the BA15s base with a single centered pin.