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The heated portion of the mirrors are not energized 100% of the time (always on).
Mirror heating is controlled by the door modules. 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 Heating is no longer active at an outside temperature greater than 25 o C and it is switched on permanently at a temperature lower than -10 o C.
From SIB 51 1 05
Mirror heating without wiper operation:
Below 41’F: 100% (continuous heating)
Above 41’F: 0% (no heating)
Mirror heating with wiper operation:
Below 41’F: 100% (continuous heating)
From 41’F to 50”F : 75%
From 50”F to 59’F: 50%
From 59’F to 68’F : 25%
Above 68’F: 0% (no heating)
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