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The 1986 W124 cars do not use a relay for the heated mirrors, power is drawn through fuse 8 whenever the key is in "run or start," as the Germans say. This is the same power connection that the outside (right side) mirror control switch in the console uses. Not sure of the W201 but probably the same, no relay.
The connection uses black/red wires and goes through X30, a multi-pin connection terminal (part of the power distribution network) located under the driver's carpet, forward of the left kick panel. It will have +12 Volts on it anytime the ignition is in start or run.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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