The Lexus ES330 back up light utilizes a 921 bulb size for the rear illumination system. Data for the specified component covers the period from 2004 through 2006.
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 bulb size specified for the back up light positions on the Lexus ES330 across the 2004-2006 model years.
The 921 is an ANSI-standardized bulb, meaning it conforms to a defined set of electrical and physical characteristics recognized across the United States and Canada.
The 921 uses a wedge-style base, designated T15, which refers to a tubular glass envelope approximately 15 eighths of an inch wide that is held in place by tension against the socket walls rather than by a bayonet or screw mechanism.
The bulb operates at 12 volts and draws 16 watts, which is consistent with standard automotive low-current incandescent reverse light applications.
Two distinct back up light positions are listed for the ES330: a general back up light and an inner back up light, both of which share the 921 specification.
The 2005 inner back up light carries a production date qualifier of "From 09/2004," indicating that this fitment applies only to vehicles produced from September 2004 onward within that model year.