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Does My 728I Have Heated Front Screen


dangerousdave
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Mirror heating is outside temperature dependant & a bit more complicated than you might expect.

Here's the blurb:

Mirror Heating


Mirror heating is controlled by the peripheral modules in the doors. The
heating function is active as of terminal 15 (ignition lock position 2). The
activation time is dependent on the outside temperature.


The general module receives the outside temperature from the IKE via the
K-bus and determines a cycle time for heating operation. This time is
transferred to the peripheral modules where it is carried out. Heating is no
longer active at an outside temperature greater than 25 oC and it is
switched on permanently at a temperature lower than -10 oC

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