Scion iQ high beam headlight bulbs use 9005 size while low beam headlight bulbs use H11 size. The replacement chart covers 2012 to 2015 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Scion iQ uses the 9005 bulb for high beam headlights across all model years from 2012-2015. This bulb follows the ANSI standard, which governs lighting specifications in the United States and Canada, and operates on a single-filament halogen design rated at 12V and 65W with a P20d base.
The low beam headlights on the Scion iQ use the H11 bulb across all model years from 2012-2015. The H11 is a single-filament halogen bulb rated at 12V and 55W, fitted with a PGJ19-2 base, and governed by the ECE standard used in Europe and internationally, though it also carries approval for use in the United States.
The 9005 and H11 bulbs differ in wattage, with the 9005 drawing 65W compared to the H11 at 55W. This difference reflects their respective roles, as high beam applications typically require greater light output than low beam configurations.
The two bulbs use physically distinct bases, the P20d for the 9005 and the PGJ19-2 for the H11, which means the high beam and low beam sockets are not interchangeable. Installing the wrong bulb type in either position is not mechanically possible without modification.
The 9005 and H11 bulbs each use a single filament, meaning neither supports a dual-function role within a single housing. The iQ therefore relies on separate bulbs to handle high and low beam functions independently.