Mercedes-Benz S420 Map Light Bulb Size

The Mercedes-Benz S420 map light requires a bulb size of H6W for the interior lighting system. Data for the specific bulb size covers the range of 1998 to 1999.

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
1998-1999	H6W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W

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Additional Notes

The H6W is the map light bulb size for the Mercedes-Benz S420 across the 1998-1999 model years.
The H6W is an ECE-standardized bulb type, meaning it conforms to the Economic Commission for Europe regulatory framework used in European and worldwide automotive lighting applications.
H6W bulbs operate on a 12-volt electrical system, which is standard for passenger vehicles of this era.
The H6W carries a 6-watt power rating, placing it in the low-wattage category typical of interior courtesy and map lighting functions.
H6W bulbs use a BAX9s base, which is an offset pin bayonet fitting. The offset pin orientation is a keying feature that prevents incorrect bulb installation, as it allows the bulb to seat only in one rotational position.
Because the BAX9s base uses offset pins, it is not interchangeable with the standard BA9s base, despite the two types sharing a similar physical profile.