Acura Legend Dome Light Bulb Size

Acura Legend dome light bulb utilizes a DE3175 size specification for interior illumination. The replacement chart covers 1986 to 1988 vehicle production years with corresponding bulb size data.

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
1986-1988	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 sole dome light bulb size listed for the Acura Legend across the 1986-1988 model years.
The DE3175 follows the ANSI standard, meaning it conforms to the bulb specification system used in the United States and Canada.
The DE3175 is a festoon-type bulb, a cylindrical form factor that seats horizontally between two spring-loaded end contacts rather than inserting into a socket.
End-cap contacts on the DE3175 mean electrical connection is made at both flat ends of the bulb, which is characteristic of the festoon design.
The DE3175 has a 31mm length, which is the critical fitment factor for festoon bulbs, as the housing span must match the bulb length for proper contact.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of that era.
Because festoon bulbs rely on physical length for fitment rather than a keyed socket, substituting a festoon bulb of a different length would result in either a loose fit or an inability to seat correctly in the Acura Legend dome light housing.