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Heated rear window

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What does the voltage sensitive switch in the heated rear window circuit actually do? I realise that it switches the chassis side of the relay through which the rear window heater element is supplied with 12V and hence can turn the rear window heater on and off, but the service manual and circuit diagram give no clue as to why it is actually there. Is it simply to ensure that the heated rear window only comes on when the engine is running? It seems an expensive way to solve that problem if that's all it does.

Any one got any good ideas?

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