Mercedes-Benz SL55 AMG Map Light Bulb Size

The Mercedes-Benz SL55 AMG map light bulb utilizes an H6W size, designated as DE3423. A replacement chart covering 2003 through 2008 model years documents the bulb specifications for this vehicle application.

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
2007-2008	H6W
2003-2006	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 SL55 AMG map light specifications cover the 2003-2008 model years, with two distinct bulb types listed across that range.
The H6W is an ECE-standard bulb, meaning it conforms to European and international regulations. It uses a BAX9s base, which is a bayonet-style cap with offset pins, and operates at 12V with a 6W output as a single-filament signalling bulb.
The DE3423 is an ANSI-standard festoon bulb, meaning it conforms to North American standards. It measures 41mm in length and makes contact through metal end caps at each end of the tube, operating at 12V.
The 2007-2008 SL55 AMG uses the H6W, while the 2003-2006 model years use the DE3423 for the map light position.
The H6W and DE3423 are not interchangeable. The H6W uses a BAX9s bayonet base, whereas the DE3423 relies on end-cap contacts in a festoon-style housing, making the mounting and contact mechanisms physically incompatible.
The regulatory standards behind these two bulbs reflect different regional frameworks. The ECE designation on the H6W indicates compliance with United Nations Economic Commission for Europe regulations, while the ANSI designation on the DE3423 reflects American National Standards Institute norms.
Both bulb types share a 12V operating voltage, which is consistent with standard automotive electrical systems.
The shift from DE3423 to H6W between the 2006 and 2007 model years represents a change in both the base type and the governing technical standard for the map light position on the SL55 AMG.