Lexus ES300 Dome Light Bulb Size

The Lexus ES300 dome light utilizes DE3175 and 194 bulb sizes for the interior illumination system. Available data covers the specific range from 1992 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
1994-2003	DE3175
1992-1993	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The Lexus ES300 dome light uses one of two bulb types across its 1992-2003 model years: the DE3175 festoon bulb or the 194 miniature wedge bulb.
The DE3175 is a festoon-style bulb, meaning it is cylindrical in form and makes electrical contact through metal caps at each end rather than through a wedge base. It measures 31mm in length and operates at 12 volts.
The 194 is a T10 miniature wedge bulb, which seats into its socket by friction through a tapered plastic base rather than end-cap contacts. It operates at 12 volts and draws 3.78 watts.
Both the DE3175 and the 194 conform to ANSI standards applicable in the United States and Canada.
The DE3175 festoon bulb is the specified dome light size for the Lexus ES300 across the 1994-2003 model years, representing the majority of the generation's production span.
The 194 wedge bulb is specified for the 1992-1993 ES300, indicating a change in dome light socket design occurred between the 1993 and 1994 model years.
Because the DE3175 uses end-cap contacts and the 194 uses a wedge base, the two bulb types are not interchangeable despite both operating at 12 volts.