GF88.79-P-2000R Heat Left/Right Outside Mirrors, Function

GF88.79-P-2000R Heat Left/right Outside Mirrors, Function
- up to model year 08

Component Identification:

Function prerequisites
^ No overvoltage or undervoltage
^ Circuit 61 ON (engine running)
^ Power window not operated

Function
The mirror heater (M21/1r1) in the left electrically adjustable and heated outside mirror (M21/1) and the mirror heater (M21/2r1) in the right electrically adjustable and heated outside mirror (M21/2) each consist of a heating resistor.
This is mounted on a foil on the rear of the mirror lens.
The power supply and the controlled switching on and off of the heating resistors is accomplished by the left door control module (N69/1) and right door control module (N69/2) For this purpose they receive a message by the CAN class B bus by the driver-side SAM control module (N10/10).

The mirror heater (M21/1r1 and M21/2r1) is switched on and off depending on the outdoor temperature, measured from by the outdoor temperature sensor indicator (B14).
At outdoor temperature below 5 °C the mirror heater (M21/1r1 and M21/2r1) is switched on and is switched off at outdoor temperatures above 10 °C
If the outdoor temperature value received by the CAN class B bus is not logical, the mirror heater (M21/1r1 and M21/2r1) is switched on

When the power window switch is actuated, the mirror heater (M21/1r1 and M21/2r1) is switched off for this time period to reduce power consumption.
If the rear window heater is switched on, the mirror heater (M21/1r1 and M21/2r1) is also switched on for this time period independent of the outdoor temperature.