The Toyota Echo uses the 9003 bulb for both high beam and low beam headlights across its entire 2000-2005 production run.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to serve both the high beam and low beam functions within one unit.
The 9003 operates at 12 volts and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange width, and this base type determines physical fitment into the headlight housing.
The 9003 is an ANSI-standardized bulb type recognized in both the United States and Canada, and it is electrically and physically equivalent to the European H4 bulb, making cross-compatible replacements widely available under either designation.
Because the same 9003 bulb serves both beam functions, replacing one bulb addresses both the high and low beam on that side of the vehicle.