Toyota Sequoia Turn Signal Bulb Size

Additional Notes

• The rear turn signal position of the Toyota Sequoia uses the 7440 or 7440NA bulb across all model years in the specifications, making it the most consistently applied bulb type across both positions in this dataset. The 7440NA is a single-filament T20 wedge bulb rated at 12V and 21W, with natural amber glass that produces the amber signal color without relying on a colored lens.
• The 7440 and 7440NA share the same T20 wedge base and 12V/21W electrical rating, but differ in glass treatment. The 7440 uses clear glass, while the 7440NA uses natural amber glass. For the Sequoia's rear turn signal, the 7440NA replaced the 7440 starting in 2005, with 2001-2004 models specifying the clear-glass 7440.
• The 4157NA is the most frequently specified front turn signal bulb in the Sequoia's history, covering model years 2008-2009 and 2012-2018. It is a dual-filament T25 wedge bulb rated at 12V with a 27W high-intensity filament and a 7W low-intensity filament, allowing it to serve both turn signal and parking light functions from a single housing.
• The 3157NA and 4157NA are both dual-filament T25 wedge bulbs with identical 12V/27W/7W ratings, but they are not interchangeable. The 4157 base has a different pin configuration than the 3157, meaning a socket designed for one will not accept the other without modification.
• The 5702AK, specified for the Toyota Sequoia front turn signal in 2010-2011, is a Sylvania-branded variant of the ANSI 3157 bulb. Rather than natural amber glass, it uses an amber coating applied to the bulb exterior. This coating achieves the amber output required by regulations but may differ in light transmission characteristics compared to natural amber glass bulbs.
• The 2019 Toyota Sequoia front turn signal specifies the 7440NA exclusively for vehicles equipped with the High Efficiency Twin Cam engine, indicating that a trim or powertrain configuration difference influenced the lighting assembly used in that model year.
• The front turn signal position shows a clear progression through three distinct bulb families across the Sequoia's production span: the 3157NA (2001-2007), the 4157NA and 5702AK (2008-2018), and the 7440NA (2019 and 2023-2024). Each family represents a different base type, and none are cross-compatible with one another despite sharing similar voltage and wattage ratings.
• The shift from dual-filament bulbs such as the 4157NA to the single-filament 7440NA in the front turn signal position for 2023-2024 models suggests a change in the lamp assembly design, as the low-intensity filament function previously handled by dual-filament bulbs would require a separate bulb or an alternative lighting circuit in a single-filament configuration.