Toyota Celica Turn Signal Bulb Size

Additional Notes

• The 1156 bulb is the most frequently specified type across the Toyota Celica turn signal positions, appearing in the rear turn signal position from 1973-1999 and in the front turn signal position from 1982-1986. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W under the ANSI standard.
• The 1157 bulb shares the same BAY15d bayonet base as the 2057 but carries a lower wattage rating of 21W/5W across its dual filaments, compared to the 2057's 26.9W/8W. Both follow the ANSI standard, and the 1993 Toyota Celica front turn signal position specifies the 2057 rather than the 1157 used in surrounding years.
• The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W. It is specified for the rear turn signal on the 2000-2002 Celica, replacing the 1156 used in prior years for that position.
• The 194 bulb is a miniature wedge type in the T10 form factor, rated at only 3.78W, making it significantly lower in output than the other turn signal bulbs in these specifications. It appears in the front outer turn signal position for 2000-2002 and in the front turn signal (side) position for 2000 and 2002.
• The PY21W is an ECE-standard amber single-filament bulb with a BAU15s bayonet base, rated at 12V and 21W. Its BAU15s base has offset pins, which physically prevents it from being interchanged with BA15s or BAY15d base bulbs such as the 1156 or 1157.
• The 2001 Celica front inner turn signal and front turn signal (side) position both specify the PY21W, while the 2000 and 2002 model years specify ANSI-standard bulbs for those same positions. The ECE and ANSI standards are not interchangeable, and the differing base types enforce this separation at the socket level.
• The 12496 is a Philips/Osram part number designation for a 12V halogen bulb in a specialty application. It is specified for the front inner turn signal on the 2000 and 2002 Celica, while the 2001 model year uses the PY21W in that same position.
• The dual-filament construction of the 1157 and 2057 bulbs, using the BAY15d base, serves both a turn signal and a secondary parking or running light function within a single housing. Single-filament types such as the 1156, 7440, and PY21W serve only one function per bulb.