The ignition switch turns on the circuit 15 relay & that relay powers-up the fuses for most of those consumers.

Check that relay in the main fuse box.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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