Toyota Sequoia Headlight Bulb Size

Additional Notes

• The Toyota Sequoia uses three distinct bulb types across its headlight system: 9005 for high beam, H11 for low beam, and 9003 for both beams combined, depending on the model year.
• The 9003 bulb is a dual-filament type, meaning a single bulb serves both the high beam and low beam functions within one housing. The Toyota Sequoia (2001-2007) relies on this configuration for both headlight positions.
• From 2008-2018, the Sequoia shifted to a split-bulb arrangement, separating the high beam and low beam into two distinct bulb types: the 9005 and the H11, respectively.
• The 9005 is a single-filament bulb rated for high beam use only. It is not interchangeable with the H11, as the two types use different base configurations and wattage ratings.
• The H11 is a single-filament halogen bulb designed exclusively for low beam operation. Its connector and base differ from the 9005, making cross-substitution between the two incompatible without modification.
• The 9003 bulb standard is also known as HB2 and is equivalent to the H4 designation used in many international markets. These designations refer to the same physical bulb and are generally interchangeable.
• Because the 2001-2007 Sequoia uses the 9003 for both beam positions, replacing a headlight assembly on those years requires only one bulb type per side, whereas the 2008-2018 models require two separate bulb types per side.
• The transition from the 9003 dual-filament setup to the separate 9005 and H11 arrangement occurred between the 2007 and 2008 model years, representing a change in headlight housing design.