The Lexus RX450hL back up light requires a 921 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2018 through 2021.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 is the sole bulb size specified for the back up light positions on the Lexus RX450hL across all listed model years.
The 921 bulb follows the ANSI standard, meaning it conforms to a standardized specification recognized across the United States and Canada, ensuring consistent electrical and physical characteristics.
The 921 is a wedge-type bulb, designated T15, which refers to its tubular shape and base style. The wedge base requires no separate metal connector, as the glass envelope itself forms the contact points.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive low-current lighting circuits.
The outer back up light on the RX450hL uses the 921 bulb for the 2018-2019 and 2021 model years.
The inner back up light position is a distinct fitment from the outer position, though both use the 921 bulb for the 2018-2019 model years.
The 2018 inner back up light carries a production date qualifier of "From 12/2017," indicating that this fitment applies only to vehicles produced from December 2017 onward within that model year.
Because the outer and inner back up light positions share the same 921 bulb size, the same physical bulb is interchangeable between both positions on applicable model years.