Buick Lucerne Back Up Light Bulb Size

The Buick Lucerne back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Data for the specified vehicle covers the period from 2006 through 2011.

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

Bulb Size by Year Range

Years	Bulb Size
2006-2011	921

Bulb Specifications

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

Other Locations

Additional Notes

The Buick Lucerne uses the 921 bulb for the back up light across all model years covered in these specifications, spanning 2006-2011.
The 921 is a wedge-type bulb, meaning it seats directly into a socket without a separate base or pins, relying on the tension of its wire leads to hold it in place.
The T15 designation refers to the bulb's tubular shape, with a width of 15 eighths of an inch, which is a standard sizing convention used across the automotive industry.
The 921 operates at 12 volts and 16 watts, consistent with a standard 12-volt automotive electrical system.
The 921 bulb carries ANSI standardization, meaning its physical and electrical specifications are governed by a recognized industry body in both the United States and Canada.
Because the 921 is an ANSI-standardized wedge bulb, it is interchangeable with other bulbs sharing the same T15 wedge base and compatible voltage and wattage ratings, provided the replacement meets those same electrical parameters.