Mazda CX-9 Map Light Bulb Size

The Mazda CX-9 map light utilizes a DE3175 bulb size for interior illumination purposes within the cabin area. Available data for the specified component covers the range from 2007 to 2020.

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
2019-2020	DE3175 (Without Adaptive Headlamps)
2007-2017	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 map light bulb size across all listed model years of the Mazda CX-9, spanning 2007-2020.
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.
The DE3175 operates at 12 volts, consistent with standard automotive electrical systems.
The "31mm" designation in the DE3175 refers to the length of the bulb between its two end caps, which is the critical fitment factor for festoon bulbs.
The DE3175 conforms to ANSI standards, indicating it meets a defined specification recognized across the United States and Canada.
For the 2019-2020 Mazda CX-9, the DE3175 map light bulb size applies specifically to trims without Adaptive Headlamps, as that feature is noted as a fitment condition for those years.
The years 2007-2018 carry no trim or package qualifiers for the DE3175 fitment, indicating the bulb size applied without condition across those model years.
Festoon bulbs such as the DE3175 are held in place by spring-loaded clips within the lamp housing, and the 31mm length must match the span between those clips for proper installation.
The DE3175 is interchangeable with other 31mm festoon bulbs that share the same end-cap contact design and 12V rating, though physical length compatibility is the primary fitment requirement.