Lexus SC430 high beam headlight bulbs use 9005 size, while low beam headlight bulbs use D4S or D2S size. The replacement chart covers 2002 through 2010 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 9005 is a single-filament halogen bulb operating at 12V and 65W with a P20d base, built to the ANSI standard used in the United States and Canada. It serves as the high beam headlight bulb across all Lexus SC430 model years covered in these specifications, spanning 2002-2010.
The low beam headlight position uses HID (xenon) discharge technology throughout the 2002-2010 SC430 range, though two distinct bulb types are specified depending on the model year.
The D2S bulb is specified for low beam fitment on the 2002-2005 SC430. It operates at 85V and 35W, uses a P32d-2 base, and requires a separate external ignitor to initiate the arc discharge. It conforms to the ECE standard.
The D4S bulb replaces the D2S in the low beam position for the 2006-2010 SC430. It operates at 42V and 35W with a P32d-5 base and is formulated without mercury, distinguishing it from earlier HID types. It also conforms to the ECE standard.
Both the D2S and D4S are designed exclusively for projector-type housings. Installing either bulb in a reflector-type housing produces improper light distribution and is not a supported fitment.
The D2S and D4S are not interchangeable. Their base configurations differ, with the P32d-2 base on the D2S and the P32d-5 base on the D4S, and their operating voltages are substantially different at 85V versus 42V respectively.
The shift from D2S to D4S between the 2005 and 2006 model years represents a change in ballast and ignitor compatibility. A D4S ballast system does not supply the high-voltage pulse that the D2S requires for ignition.
The 9005 halogen high beam and the D-series HID low beam operate on different electrical principles and are served by separate circuits, with no interchangeability between the two positions.