Lexus SC430 Map Light Bulb Size

The Lexus SC430 map light utilizes bulb sizes 57 and DE3175 for illumination within the interior cabin area. Available data for the specified components covers the range from 2002 through 2010.

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
2004-2010	57 (Center)
2004-2010	DE3175 (Left AND Right)
2002-2003	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Lexus SC430 map light system uses two distinct bulb types across its model years: the 57 and the DE3175.
The DE3175 is a festoon-style bulb measuring 31mm in length with end-cap contacts, operating at 12V. It follows the ANSI standard applicable to the US and Canada markets.
The 57 is a single-filament bulb with a BA9s base, rated at 12V and 1W. It also conforms to the ANSI standard for US and Canada markets.
The BA9s base on the 57 bulb is a bayonet-style miniature base, which is physically incompatible with the end-cap contact design of the DE3175 festoon bulb. The two types are not interchangeable.
For the 2004-2010 SC430, the map light system uses a three-position layout: a center position fitted with the 57 bulb and separate left and right positions each fitted with the DE3175 bulb.
For the 2002-2003 SC430, the map light specification lists only the DE3175, with no positional distinction between center, left, or right.
The DE3175 is the only bulb type present across all model years covered in the specifications, appearing in every year from 2002 through 2010.
The 57 bulb is specific to the center map light position and is listed only for the 2004-2010 model years.