Unfortunitly the w203 is different from the W140. In fact it appears the W140 had changes in the late model mirrors. Here is the wiring diagram for a 1997 Mercedes-Benz S420 Not sure if it's gonna match the 2001.

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1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

How to eliminate oil dependency through market-driven approaches.
“We could cut oil use in half by 2025, and by 2040, oil use could be zero,”
The Sound of Diesel Speed
Ode to MB