The Toyota Prius back up light utilizes bulb sizes 921 and 7440 depending on the specific version of the vehicle being serviced for lighting maintenance. Available information covers a range from 2001 through 2022 to provide details for various production periods of the automobile.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is a T15 wedge type rated at 12V and 16W. It follows the ANSI standard used in the United States and Canada.
The 7440 bulb is a single-filament T20 wedge type rated at 12V and 21W, also conforming to the ANSI standard for the US and Canadian markets.
The 7443 bulb shares the T20 wedge form with the 7440 but carries a dual-filament design rated at 12V with outputs of 21W and 5W. The two filaments serve separate lighting functions within the same housing.
Although the 7440 and 7443 are both T20 wedge bulbs operating at 12V, they are not interchangeable. The 7443 has a dual-filament construction, and substituting one for the other in the Toyota Prius back up light circuit would result in incorrect function.
The Toyota Prius back up light uses the 921 bulb for the 2001-2003 model years, transitions to the 7440 for 2004-2015, and returns to the 921 for 2016-2022, with no entry recorded for 2020 or 2021.
The Outer Back Up Light on the Toyota Prius uses the 7443 for 2004-2015, with the 2009 model year specifying that fitment applies only to vehicles produced through March 2009.
The 2016 Outer Back Up Light specifies the 921 bulb with a production date qualifier of from November 2015, indicating that earlier-built 2016 model year vehicles may follow a different specification.
The Outer Back Up Light for the 2001-2003 model years uses the 921 bulb, placing it in the same specification as the standard back up light for those years.