The Lexus RX400h back up light bulb uses a 921 size, with the inner back up light bulb also requiring a 921 size. The replacement chart covers vehicle production years from 2006 to 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 is the bulb size specified for both the standard back up light and the inner back up light on the Lexus RX400h across the 2006-2008 model years.
The 921 bulb follows the ANSI standard, which is the recognized specification system used in the United States and Canada for automotive lighting components.
The 921 bulb uses a wedge-style base, designated T15, which refers to a tubular bulb body approximately 15 eighths of an inch wide that is held in place by friction rather than a bayonet or screw mechanism.
The 921 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
The 921 is rated at 16 watts, which reflects its power draw and contributes to the brightness output of the reverse lighting function.
The RX400h back up light system includes two distinct positions, a standard back up light and an inner back up light, both of which share the same 921 bulb specification across all listed model years.
Because both lighting positions use the same bulb size, a single 921 bulb type is interchangeable between the two positions on this vehicle.