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

MODEL 217, 222 

Function requirements, general 

• No overvoltage or undervoltage
• Circuit 15R ON
• Valid mirror selection available

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

Mirror lens adjustment left/right outside mirror, general 

The mirror glass 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 function sequence 
• Storing/calling function sequence for mirror glass position (with CODE (275) Memory package for electrically adjustable front seats, model 217) 

Adjust mirror glass function sequence 

The corresponding outside mirrors are selected via the left outside mirror adjustment switch (S20s7) or right outside mirror adjustment switch (S20s8) in the driver side power window and outside mirror adjustment switch group (S20).

The corresponding selection is indicated by an LED in the outside mirror adjustment switch in question. The left front door control unit actuates the LED in the corresponding outside mirror adjustment switch via the left front door LIN (LIN B5).

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 adjustment request for the corresponding outside mirror via the left front door LIN. The left front door control unit transmits the adjustment request for the right outside mirror to the right front door control unit (N69/2) via the interior CAN.

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

Storing/calling function sequence for mirror glass position (with CODE (275) Memory package for electrically adjustable front seats, model 217) 

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

• Store mirror glass position function sequence 
• Retrieve mirror glass position function sequence 

Store mirror glass position function sequence 

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

• Press and hold down left front memory function switch (S22s6). Then press left front memory switch 1 (S22s7), left front memory switch 2 (S22s8) or left front memory switch 3 (S22s9).
• Press left front memory function switch for t > 100 ms. Press one of the memory switches within t = 0.2 to 3 s.

The status of this switch is read in by the left front door control unit via left front door LIN and sent via interior CAN to the driver seat control unit (N32/1). The driver seat control unit sends the request to store the mirror glass position to the left front door control unit and the right front door control unit via the interior CAN.

The position of the outside mirrors 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)

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

Successful storage is confirmed by an acknowledgment tone from the instrument cluster (A1).

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

Additional function requirements for calling mirror glass positions 

• Circuit 15RON or door status changed (run-on active)

Retrieve mirror glass position function sequence 

A stored mirror position can be called up via one of the memory switches. For this purpose, actuate one of the memory switches until the stored position is reached.

Actuation of the corresponding memory switch is read in by the left front door control unit via the left front door LIN and transmitted to the driver seat control unit via the interior CAN. This requests the left front door control unit and right front door control unit to move the mirror glasses to the stored position via the interior CAN.

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

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

If circuit 15R is switched off, the mirror glass position can be called for t = 180 s. If a change occurs during the run-on time to the circuit status (e.g. from "Circuit 15CON" after Circuit 15COFF") or if a door status changes, the run-on time starts again. Even in the event of a change in the door status or a change in the circuit status after an optional amount of time, the run-on phase starts again, which means that even prior to driving off, the mirror glass positions can be adjusted after opening a door without switching on circuit 15R for t = 180 s.

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