Defroster in left/right outside rearview mirror, function

Function sequence

1 Function prerequisites

 Key in ignition or glow/starter switch in position 2
(circuit 15).

2 Thermostat on rear of mirror glass measures temperature of mirror glass.

3 At a mirror glass temperature of  15 °C the mirror defroster is switched on by the thermostat.

4 Upon reaching the temperature of  25 °C on the mirror glass the mirror defroster is switched off by the thermostat.

5 The mirror defroster continues to be switched on and off until the temperature on the mirror remains  15 °C.