Mirror Lens Adjustment Left/Right Outside Mirror, Function - GF88.79-P-2008FR

Model 257, 290 up to model year 2021 

Function requirements, general 

• No overvoltage or undervoltage
• Circuit 15R ON

The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the interior CAN (CAN B) to the left front door control unit (N69/1).

Mirror lens adjustment left/right outside mirror, general 

The mirror glasses in the left outside mirror (M21/1) and right outside mirror (M21/2) can be adjusted electrically.

The left/right outside mirror glass adjustment comprises the following partial functions:

• Adjust mirror glass 
• Storing/calling up mirror glass position (with code 275 (Memory-package)) 

Adjust mirror glass 

The corresponding outside mirror is selected via the left outside mirror adjustment switch (S20s7) or the right outside mirror adjustment switch (S20s8) in the driver side power window and outside mirror adjustment switch group (S20). The selected outside mirror is displayed by an LED in the corresponding outside mirror adjustment switch. The selected outside mirror can be adjusted to the desired position with the outside mirror adjustment switch (S20s9). The position can be adjusted horizontally and vertically.

The left front door control unit reads in the corresponding status via left front door LIN (LIN B5) and transmits the request "Outside mirror actuator motor) for the right outside mirror via the interior CAN to the right front door control unit (N692). At the same time, the left front door control unit sends a corresponding signal for visual feedback via the LED in the corresponding outside mirror adjustment switch via left front door LIN to the driver side power window and outside mirror adjustment switch group.

The left front door control unit actuates the vertical inclination adjustment actuator motor (M21/1m1) and horizontal inclination adjustment actuator motor (M21/1m2) in the left outside mirror. The right front door control unit actuates the vertical inclination adjustment actuator motor (M21/2m1) and horizontal inclination adjustment actuator motor (M21/2m2) in the right outside mirror.

Storing/calling up mirror glass position (with code 275 (Memory-package)) 

The storing/calling up mirror glass position function comprises the following subfunctions:

• Store mirror glass position 
• Calling mirror glass position 

Store mirror glass position 

There are two buttons for storing with the left front seat adjustment switch group (S22):

• Press and hold down left front memory function switch (S22s7). Then press left front memory switch 1 (S22s8), left front memory switch 2 (S22s9) or left front memory switch 3 (S22s10).
• Press memory switch function at front left for longer than 100 ms. Then press left front memory switch 1, left front memory switch 2 or left front memory switch 3 within 0.2 to 3 s.

The left front door control unit reads in the status of the switch via the left front door LIN and transmits this via the interior CAN to the driver seat control unit (N32/1). The driver seat control unit then transmits the request to store the memory position via the interior CAN to the left front door control unit and right front door control unit.

The position of the outside mirror is stored in the left front door control unit and right front door control unit based on the data from the following potentiometers:

• Vertical inclination adjustment potentiometer (M21/1r2)
• Horizontal inclination adjustment potentiometer (M21/1r3)
• Vertical inclination adjustment potentiometer (M21/2r2)
• Horizontal inclination adjustment potentiometer (M21/2r3)

The left front door control and right front door control unit directly read in the signals from the corresponding potentiometers.

Parallel to this the position of the driver seat and steering column is stored in the driver sear control unit.

Successful storage is confirmed by an acknowledgment tone from the instrument cluster (H461).

The driver seat control unit sends the request to output an acknowledgment tone via the interior CAN, electronic ignition lock control unit and user interface CAN (CAN HMI) to the instrument cluster (A1), which actuates the instrument cluster speaker directly.

Calling mirror glass position 

A stored mirror glass position can be called up via one of the left front memory switches. To do so, one of the left front memory switches must be pressed until the stored position is reached.

The left front door control unit reads in the status of the corresponding left front door memory switch via left front door LIN and transmits it via the interior CAN to the driver seat control unit. The driver seat control unit then transmits the request to store the memory position via the interior CAN to the left front door control unit and right front door control unit.

The left front door control unit actuates the vertical inclination adjustment actuator motor and the horizontal inclination adjustment actuator motor in the left outside mirror.

The right front door control unit actuates the vertical inclination adjustment actuator motor and horizontal inclination adjustment actuator motor in the right outside mirror.

	Electrical function schematic for mirror lens adjustment		PE88.79-P-2051-97XBA
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