Acura MDX Dome Light Bulb Size

The Acura MDX dome light bulb utilizes 2 distinct sizes: DE3022 and DE3175, with each size corresponding to specific vehicle configurations. The replacement chart covers 2001 through 2020 production years and details bulb size specifications for each model year.

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
2020	DE3022
2001-2009	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3022
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The DE3175 is the dominant bulb type across the Acura MDX dome light specifications, appearing in nine of the ten model years listed, spanning 2001-2009.
Both the DE3022 and DE3175 are festoon-style bulbs, meaning they are cylindrical in shape and make electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips within the dome light housing, which grip the end caps to maintain both mechanical and electrical contact.
Both bulbs share a 31mm length and operate at 12 volts, which reflects the standard electrical system voltage in passenger vehicles.
Both the DE3022 and DE3175 conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of physical and electrical specifications within those markets.
The 2020 Acura MDX uses the DE3022, while the 2001-2009 models use the DE3175. Despite sharing the same length and voltage rating, these are distinct part numbers and are not confirmed as interchangeable by the specifications.
The physical similarity between the DE3022 and DE3175, including their shared 31mm length and end-cap contact design, can make visual distinction between the two difficult without referencing the part number directly.