Heating left/right exterior rearview mirrors, function - GF88.79-P-2000S

MODEL 215, 220

Fig 1: Identifying Heated Left/Right Exterior Rearview Mirrors, Function Diagram

Function prerequisites

Voltage not too low or too high
C.61 ON

Function

The left mirror heater (M21/1r1) in the left electrically adjustable and heated exterior rearview mirror (M21/1) and the right mirror heater (M21/1r1) in the right electrically adjustable and heated exterior rearview mirror (M21/2) consist of a heater resistor connected in series with a PTC resistor. The heater resistor is located on the rear of the mirror glass to which it is permanently bonded. The power supply and regulated switching on and switching off of the heater resistors is accomplished by the left front door control module (N69/1)/right front door control module (N69/2) . The mirror heater is controlled in relation to the outside air temperature (CAN message from the left front SAM control module (N10/6)) and the dew point (CAN message from automatic A/C pushbutton control module (N22)).

	Left front door control module, location/purpose/design/function		GF72.29-P-4105S
	Right front door control module, location/purpose/design/function		GF72.29-P-4106S
	Left signal-acquisition and actuation module, location/purpose/design/function		GF54.21-P-4101S
	Right signal-acquisition and actuation module, location/purpose/design/function		GF54.21-P-4102S