The Lexus GS430 back up light requires a 921 bulb size for proper illumination and function. Available data for the specified component covers the period from 2001 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is the sole back up light bulb size specified for the Lexus GS430 across all listed model years, spanning 2001-2007.
The 921 is an ANSI-standardized bulb, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 921 uses a wedge-style base, designated T15, which refers to a tubular bulb body approximately 15 eighths of an inch wide. This base type requires no locking pins, as the bulb is held in place by tension within the socket.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive electrical systems.
For the 2006-2007 Lexus GS430, the back up light assembly is divided into inner and outer sub-positions, both of which use the 921 bulb.
For model years 2001-2005, the back up light specification is attributed to the outer back up light position, with the 921 bulb specified in each of those years.
Because the 921 is an ANSI-standardized wedge bulb, it is broadly interchangeable with other bulbs sharing the T15 wedge base and matching voltage and wattage ratings, provided the physical fit within the housing is confirmed.