INFINITI I35 Back Up Light Bulb Size

The INFINITI I35 back up light requires a bulb size of 921 for the rear lighting assembly. Data for the specific component covers the period from 2002 to 2004.

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
2002-2004	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 bulb is the sole back up light bulb size listed for the Infiniti I35 across its 2002-2004 model years.
The 921 is a wedge-type bulb, meaning it uses a plastic wedge base rather than a metal contact pin or bayonet fitting, allowing it to be inserted directly into a matching socket without rotation.
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 envelope.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive electrical systems.
The 921 carries an ANSI designation, indicating it conforms to a standardized specification recognized in both the United States and Canada.
Because the 921 is an ANSI-standardized wedge bulb, it is generally interchangeable with other bulbs sharing the same T15 wedge base and equivalent voltage and wattage ratings, provided the physical fit within the housing is confirmed.