nickwilliams Posted September 21, 2010 Share Posted September 21, 2010 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? Quote Link to comment Share on other sites More sharing options...
western Posted September 21, 2010 Share Posted September 21, 2010 it switches the heated rear window circuit off if the engine isn't running after a certain time period to prevent the battery being drained. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted September 21, 2010 Share Posted September 21, 2010 If your expensive VSR is knackered, you can live without it. There's an thread in the tech archive about it, I'll see if I can find it. Here it is Mo Quote Link to comment Share on other sites More sharing options...
landmannnn Posted September 21, 2010 Share Posted September 21, 2010 Is it simply to ensure that the heated rear window only comes on when the engine is running? Yes Quote Link to comment Share on other sites More sharing options...
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