Toyota Corolla Trunk Bulb Size

Additional Notes

• The Toyota Corolla trunk bulb specifications cover two bulb sizes across all listed model years: the 194 and the 168. Both are classified under the ANSI standard applicable to the US and Canadian markets, and both share the T10 miniature wedge form factor, meaning they are physically the same shape and base type.
• Despite sharing the same T10 wedge base, the 194 and 168 are not interchangeable without consideration of wattage. The 194 operates at 3.78W, while the 168 operates at 4.9W, a difference that affects the electrical load placed on the circuit.
• The 194 bulb is the more frequently specified size across the Toyota Corolla trunk fitment data, appearing in model years 1993-2000, 2003-2008, 2014-2016, and 2023-2024, among others.
• The 168 bulb is specified for the Toyota Corolla trunk in 2001-2002, 2009-2013, 2020, and 1986, representing a recurring but less frequent fitment across the listed data.
• Both bulb types operate on a 12V system, which is standard for automotive lighting circuits in passenger vehicles of these model years.
• The T10 wedge base is a pinless design where the bulb is held in place by the tension of the socket walls rather than locking pins, a construction common to low-wattage interior and courtesy lighting applications.
• The wattage difference between the two bulb types means that substituting a 168 in place of a 194 fitment, or vice versa, would result in a mismatch with the original circuit specification for that model year.