INFINITI QX4 Dome Light Bulb Size

The INFINITI QX4 dome light requires a DE3175 bulb size for proper installation and function within the interior cabin lighting system. Available data covers the range from 1997 through 2003 for the specified vehicle components.

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
1997-2003	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The DE3175 is the dome light bulb size for the INFINITI QX4 across all model years covered in the specifications, spanning 1997-2003.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting method common in interior dome and map light applications.
The DE3175 has a nominal length of 31mm, which is the figure the "31" in its designation refers to and is the critical fitment specification for this bulb type.
The bulb operates at 12 volts, consistent with the standard electrical system voltage of passenger vehicles.
The DE3175 designation follows ANSI standards recognized in both the United States and Canada, indicating a standardized specification rather than a proprietary one.
Because festoon bulbs are sized primarily by length, a DE3175 replacement must match the 31mm length to seat correctly in the fixture's spring clips.
The DE3175 is interchangeable with other bulbs sharing the same 31mm festoon format and 12V rating, provided the wattage is compatible with the vehicle's socket.