Toyota Highlander Parking Light Bulb Size

Additional Notes

• The 7444NA is the most frequently specified bulb across the Toyota Highlander front parking light positions, covering the 2017-2024 model years as well as 2014-2016.
• The 7444NA is an ANSI-standard dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W high filament and 5W low filament. Its natural amber glass produces the amber color required for parking light applications without the use of a colored lens or coating.
• The 3457NA shares the same ANSI-standard natural amber glass construction and dual-filament design as the 7444NA but uses the larger T25 wedge form factor and carries higher wattage ratings of 27W and 7W. It is specified for the 2011-2013 model years.
• Because the 7444NA and 3457NA differ in physical size and wattage, they are not interchangeable with each other despite sharing the same natural amber glass finish and dual-filament configuration.
• The P21/5W follows the ECE standard rather than the ANSI standard used by the 7444NA and 3457NA. It uses a BAY15d bayonet base rather than a wedge base, making it physically incompatible with sockets designed for T20 or T25 wedge bulbs.
• The P21/5W is specified for the Toyota Highlander (2001-2005) front parking light position and carries the same 12V, 21W/5W electrical rating as the 7444NA, though the two bulbs use entirely different base types.
• The dual-filament design present in all three bulb types allows a single bulb to serve two distinct brightness levels, which is typical for positions that function as both a parking light and a turn signal or brake light indicator.
• The shift from P21/5W to ANSI-standard wedge bulbs across the Highlander's production history reflects a change in the base type standard used, from the BAY15d bayonet format to the wedge-style T-series format.