Toyota Supra Dome Light Bulb Size

The Toyota Supra dome light requires a DE3175 bulb size for proper illumination within the interior cabin area. Available data for the specified component covers the period from 1987 through 1993.

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 Type	Shop
1987-1993	DE3175	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175	Check Price

Other Locations

Additional Notes

The Toyota Supra uses the DE3175 bulb size for the dome light across all listed model years, spanning 1987-1993.
The DE3175 is classified as a festoon bulb, a form factor characterized by a cylindrical body with flat metal end-cap contacts on each end rather than a screw or bayonet base.
The 31mm figure in the DE3175 designation refers to the length of the bulb, which is the critical fitment specification for festoon-type bulbs, as the end caps must bridge the socket contacts at a fixed span.
The DE3175 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The DE3175 carries ANSI standardization applicable to the United States and Canada, meaning the bulb conforms to a defined specification recognized across those markets rather than being a proprietary part number.
Because festoon bulbs rely on length for proper contact, substituting a festoon bulb of a different length, even with the same voltage rating, would result in a poor or failed connection in the Toyota Supra dome light socket.