Toyota Sienna Headlight Bulb Size

Additional Notes

• The 9005 bulb is the high beam headlight type used across the Toyota Sienna for model years 2004-2018, making it the most consistently specified bulb in these listings. It operates at 65 watts and uses a single-filament design with a P20d base, producing a focused beam pattern suited for high beam applications.
• Model years 1998-2003 of the Toyota Sienna used the 9003 bulb for both high beam and low beam functions. The 9003 is a dual-filament bulb, meaning a single unit serves both beam modes within one housing, which differs from the separate bulb arrangement used in later model years.
• The H11 bulb is specified for low beam headlights on halogen-equipped Siennas from 2011-2018. It is a single-filament halogen bulb with an L-shaped base and a PGJ19-2 connector, rated at 55 watts. Its base design makes it non-interchangeable with the 9006 bulb used in earlier halogen configurations despite similar wattage ratings.
• The 9006 bulb served as the low beam halogen option for model years 2004-2010. Like the H11, it is a single-filament 55-watt bulb, but it uses a different base configuration. Substituting an H11 for a 9006 or vice versa is not a direct plug-in swap due to differing base designs.
• Two distinct HID bulb types appear across the Sienna's low beam specifications. The D2R was used in HID-equipped vehicles from 2004-2010, while the D4S replaced it in HID-equipped vehicles from 2011-2014. These two types are not interchangeable, as D2R bulbs contain an internal UV-blocking coating suited for projector and reflector housings, while D4S bulbs are mercury-free and designed for specific projector lens systems.
• For model years 2004-2014, the low beam headlight position on the Toyota Sienna required identifying the specific headlamp system installed on the vehicle before selecting a replacement bulb. Halogen-equipped vehicles and HID-equipped vehicles used entirely different bulb types in the same model year, and installing the wrong type is not mechanically possible without modification.
• The D4S is a high-intensity discharge bulb operating at approximately 35 watts, producing significantly more luminous output than the 55-watt halogen alternatives listed for the same model years. The higher light output of HID systems is a result of the arc discharge process rather than a heated filament, which also accounts for the different ballast hardware required to operate them.
• The 9003 bulb, used in the 1998-2003 Sienna, is also known by the designation H4 in international markets. Despite functional equivalence, the two designations reflect different regional standards, and fitment should be confirmed against the specific designation listed for the vehicle rather than assumed based on cross-market equivalency.
• The high beam circuit for the 2004-2018 Sienna remained on the 9005 bulb regardless of whether the low beam system was halogen or HID. In HID-equipped configurations, the high beam and low beam therefore used entirely different bulb technologies operating in separate housings.
• The year 2018 is listed with a single low beam specification of H11 without a conditional note, indicating that the halogen configuration is the only low beam type recorded for that model year in these specifications.