I don't know about the 126, but on the 124 the horn and climate control are on separate fuses. Did you try checking for 12V at the horn terminals? If you don't have the service literature, I highly recommend you get it. It will be invaluable for all your problems. Plus it has the entire electrical diagram.
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2002 E320 T-sedan (210.282) 219K
1994 E320 (124.032) 252K (dearly departed in hit & run)
1988 260E (124.026) 301K (sold)
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