Passenger-side outside mirror park position, function

Function requirements, general

 No overvoltage or undervoltage

 Circuit 15 ON or Circuit 15R ON

 Function in instrument cluster (A1) enabled

 The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the interior CAN (CAN B) to the right front door control unit (N69/2).
The instrument cluster transmits the status "Passenger side outside mirror park position enabled" and the vehicle speed to the right front door control unit via the interior CAN.

Passenger-side outside mirror park position, general

It is possible to save and call a park position of the outside mirror (M21/2) when the car is shifted into reverse, allowing the driver to see the curb.

The passenger-side outside mirror park position function includes the following subfunctions:

 Store park position function sequence

 Function sequence for calling park position

 Function sequence for calling drive position

Store park position function sequence

To define the park position of the right outside mirror, it is necessary to first select the outside mirror, then shift into reverse and adjust right outside mirror.

The right outside mirror is selected by actuating the right outside mirror adjustment switch (S20s11) in the driver side power window and outside mirror adjustment switch group (S20).

The "reverse gear engaged" status is defined as follows:

Vehicles with transmission 711, 716:

Reverse gear engagement is detected via the status of the backup lamp switch (S16/2), which is read in directly by the front SAM control unit with fuse and relay module (N10/1).

Vehicles with transmission 722.6:

The request to engage gear range "R" is defined by the corresponding selector lever position .

The electronic selector lever module control unit (N155) transmits the selector lever position via drive train CAN (CAN C), CDI control unit (N39) (with diesel engine) or ME-SFI [ME] control unit (N310) (with gasoline engine) and chassis CAN (CAN E) to the front SAM control unit.

Vehicles with transmission 722.9, 725:

Gear range "R" is engaged through the fully integrated transmission control unit (Y3/8n4).

Then the fully integrated transmission control unit transmits the status "Gear range R engaged" via drive CAN, CDI control unit or ME-SFI control unit and chassis CAN (up to 31.05.2013) or chassis CAN 1 (as of 01.06.2013) to the front SAM control unit.

Two microprocessors are integrated into the front SAM control unit: one for control of basic functions e.g. the exterior lights, and the second for control of the central gateway functions. Both processors communicate with each other internally via interior CAN.

Using all incoming information, the microprocessor which controls the central gateway functions generates the "Reverse gear engaged" signal irrespective of the transmission variant and sends this signal to the reversing camera control unit via the interior CAN.

The right outside mirror is adjusted by actuating the outside mirror adjustment switch (S20s12). The left front door control unit (N69/1) reads in the selection and requests for adjusting via left door LIN (LIN B5) and sends corresponding requests to adjust the right outside mirror via interior CAN to the right front door control unit. The right front door control unit then actuates the vertical inclination adjustment actuator motor (M21/2m1) and horizontal inclination adjustment actuator motor (M21/2m2) accordingly.

The right front door control directly reads in the signals from the vertical inclination adjustment potentiometer (M21/2r2) and horizontal inclination adjustment potentiometer (M21/2r3), evaluates them and automatically stores the current position of the right outside mirror as the park position.

The park position of the right outside mirror can also be stored manually using the left front memory function switch (S22s6).

The park position is stored by actuating the left front memory function switch in the left front seat adjustment switch group (S22). After momentarily pressing the left front memory function switch and then actuating the outside mirror adjustment switch in any direction within t = 3 s, the current position of the right outside mirror in the right front door control unit is stored as park position.

The left front door control unit reads in the corresponding requests via left door LIN and transmits the requests to adjust the right outside mirror and to store the park position to the right front door control unit via the interior CAN.

 Manual adjustment of the right outside mirror in the park position is stored as new park position.

Function sequence for calling park position

When the reverse gear is engaged for t > 0.6 s, the park position of the right outside mirror is moved to.

 Detailed information on signal flow "Reverse gear engaged" is given in the chapter "Store park position".

The right front door control unit then receives the status "Reverse gear engaged" and actuates the vertical inclination adjustment actuator motor and horizontal inclination adjustment actuator motor until the park position is reached. The mirror glass position is recognized using the data of the vertical inclination adjustment actuator motor and horizontal inclination adjustment actuator motor.

Function sequence for calling drive position

The right outside mirror is automatically moved to the driving position when one of the following conditions is met:

 Circuit 15 OFF

 Signal "Reverse gear not engaged" is present for t = 10 s

 Vehicle speed v > 10 km/h

 Right outside mirror adjustment switch not actuated

The driving position is resumed even when the right outside mirror is adjusted manually via the outside mirror adjustment switch.