Lexus IS200t Back Up Light Bulb Size

The Lexus IS200t back up light requires a 921 bulb size for the specific lighting component located at the rear of the vehicle. Data for the bulb size covers the range from 2016 through 2016.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Inner Back Up Light

Years	Bulb Size
2016-2017	921 (To 10/2016)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the specified size for the inner back up light on the Lexus IS200t, applying to the 2016-2017 model years with a production cutoff of October 2016.
The 921 bulb follows the ANSI standard, which is the American National Standards Institute designation used across the United States and Canada to define consistent electrical and physical bulb characteristics.
This bulb uses a wedge-style base, classified under the T15 form factor. A wedge base means the glass envelope itself acts as the retaining mechanism when inserted into the socket, with no separate metal base or pins.
The T15 designation refers to the bulb's tubular shape, with the numeric portion indicating a width of 15 eighths of an inch across the widest point of the envelope.
The 921 operates at 12 volts, which is consistent with standard automotive electrical systems found in passenger vehicles.
At 16 watts, the 921 is a relatively low-wattage incandescent bulb, a rating that reflects its role as a signaling and visibility light rather than a primary illumination source.
The production cutoff notation of "To 10/2016" indicates that this fitment applies to vehicles manufactured through October 2016, meaning the specification is tied to a specific assembly period rather than the full calendar year alone.