Mercedes-Benz S63 AMG Map Light Bulb Size

Additional Notes

• The Mercedes-Benz S63 AMG map light uses two distinct bulb types across its production years, with the 12961 covering the 2009-2013 model years and the H6W assigned to the 2008 model year.
• The 12961 is a Philips part number designation for a T10 miniature wedge bulb, operating at 12 volts and 5 watts with a W2.1x9.5d base.
• The T10 wedge base is one of the most widely used bases in automotive interior lighting, relying on friction and spring tension rather than a locking mechanism to secure the bulb in its socket.
• The H6W is an ECE-standard bulb, meaning its specifications are governed by the Economic Commission for Europe, a classification recognized across European and international markets.
• The H6W operates at 12 volts and 6 watts, drawing 1 watt more than the 12961, and uses a BAX9s base, which is an offset pin cap that physically prevents incorrect installation.
• The BAX9s base of the H6W is not interchangeable with the W2.1x9.5d wedge base of the 12961, as the two base types are mechanically incompatible with each other.
• The 2008 Mercedes-Benz S63 AMG therefore requires a different map light bulb than the 2009-2013 model years, and substituting one type for the other is not possible without socket modification.
• The H6W is a single-filament bulb, a construction typical of signalling and interior applications where continuous illumination rather than high-intensity output is the primary function.