Mercedes-Benz SLK320 Map Light Bulb Size

Mercedes-Benz SLK320 map light bulb utilizes H6W and DE3423 size specifications for interior illumination. The replacement chart covers 2001 through 2004 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
2004	H6W
2001-2003	DE3423

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

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Additional Notes

The Mercedes-Benz SLK320 map light uses two distinct bulb types across its model years: the H6W for 2004 and the DE3423 for 2001-2003.
The H6W is governed by ECE standards, which are used in Europe and internationally, while the DE3423 follows ANSI standards, which apply in the US and Canada.
These two bulbs are not interchangeable, as they differ in base type, physical form, and standardization origin.
The H6W uses a BAX9s base, which is an offset pin base that locks the bulb into a specific rotational position within its socket.
The DE3423 is a festoon-type bulb, meaning it is cylindrical in form and makes contact through metal end caps at both ends rather than through a pin or wedge base.
The DE3423 has a length of 41mm, which is a standard festoon size also commonly referenced as the 41mm or SV8.5 festoon format in automotive applications.
Both bulb types operate on a 12V electrical system, consistent with standard automotive voltage.
The H6W is rated at 6 watts, classifying it as a low-wattage signalling bulb rather than an illumination bulb, which reflects its role in interior map lighting.
The shift from DE3423 in 2001-2003 to the H6W in 2004 represents a change in both the bulb standard and the socket type, meaning the 2004 model requires a physically different replacement bulb than earlier model years.