Mercedes-Benz SLK230 Map Light Bulb Size

The Mercedes-Benz SLK230 map light utilizes H6W and DE3423 bulb sizes for the interior lighting system. Data for the specified components covers the period from 1998 through 2004.

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
1998-2003	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

Other Locations

Additional Notes

The Mercedes-Benz SLK230 map light uses two distinct bulb types across its model years: the H6W for 2004 and the DE3423 for 1998-2003.
The H6W is an ECE-standard bulb, meaning it conforms to European and international regulations. It operates at 12V with a 6W output and uses a BAX9s base, which is a offset pin base that prevents incorrect installation.
The DE3423 is an ANSI-standard festoon bulb, meaning it conforms to North American specifications. It measures 41mm in length and makes contact through metal end caps at both terminals, operating at 12V.
The H6W and DE3423 are not interchangeable. The H6W uses a BAX9s pin base, while the DE3423 uses end-cap contacts, making the two physically incompatible with each other's sockets.
The regulatory standard difference between the two bulbs reflects a shift in the sourcing or regional specification of the SLK230 for the 2004 model year, where the ECE-standard H6W replaced the ANSI-standard DE3423.
The wattage of the DE3423 is not specified in the available data, whereas the H6W is rated at 6W. Both bulbs operate on a 12V electrical system.
Festoon bulbs such as the DE3423 are held in place by spring tension against the end caps rather than by a twist or push-lock base, which is a characteristic of their fitment style in map light housings.