Toyota Celica Brake Bulb Size

Additional Notes

• The 1157 bulb is the most widely used brake bulb size across the Toyota Celica's brake lighting specifications, appearing across the standard brake position from 1971-1999, which represents the majority of model years covered in the data.
• The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output and a BAY15d bayonet base, where the two filaments serve separate functions, typically one for running light duty and one for braking intensity.
• The 7443 is also a dual-filament bulb with a 21W/5W rating at 12V, but it uses a T20 wedge base rather than a bayonet mount, making it physically incompatible with sockets designed for the 1157 despite sharing the same wattage output.
• The Toyota Celica (2000-2002) shifted the standard brake and outer brake positions from the 1157 to the 7443, meaning these two bulb types are not interchangeable even though their electrical ratings are identical.
• The center high mount stop light on the Celica used the 921 for 1994-1999, a single-filament T15 wedge bulb rated at 12V and 16W, which is a lower wattage than the brake bulbs used in the other positions.
• The 1156 bulb, specified for the center high mount stop light on 1987-1993 models, is a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. Its BA15s base differs from the BAY15d base of the 1157, and the two are not interchangeable despite a similar physical appearance.
• The center high mount stop light transitioned from the 1156 to the 921 between the 1993 and 1994 model years, representing a change in both base type and wattage for that specific position.
• All four bulb types listed across these specifications conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances within those markets.