On my MB lorry the heated mirrors are always on when ignition is on.
Most unusual that, never come across a lorry where they were permanently switched on before...indeed most won't switch on until the engine is running, presumably to help prevent battery running down.
Heaters one of the best things for lorry mirrors though, those little bolted in place flat mirrors with no heating years ago were little short of useless...yet somehow we still managed to avoid errant cyclists...doh should i have said that..:-)
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