Left/right heated outside rearview mirror, function

P88.79-2051-09

Data flow

1 Outside temperature

2 Circuit 61 (engine running)

CAN CAN Class B

N10/1 Driver-side SAM control module with fuse and relay module

N69/1 Left front door control module

N69/2 Right front door control module

B14 Ambient temperature display temperature sensor

G2 Alternator

M21/1r1 Mirror heater

M21/2r1 Mirror heater

Function requirements:

 C. 61 "ON" (engine running)

 Power window not operated

 No overvoltage or undervoltage

Operation

The mirror heater (M21/1r1) in the left electrically adjustable and heated outside rearview mirror (M21/1) and mirror heater (M21/2r1) in the right electrically adjustable and heated outside rearview mirror (M21/2) each consists of one heating resistor located on a foil on the rear of the mirror glass.

The power supply and the controlled switching on and off of the heating resistors is accomplished by the left front door control module(N69/1)/ right front door control module (N69/2). For this purpose the corresponding control module receives a CAN class B message from the driver SAM control module with fuse and relay module (N10/1). The mirror heater is switched on and off depending on the outside temperature.