Fold left/right outside mirror, function

Function requirements, general

 No overvoltage or undervoltage

Left/right folding outside mirror, general

The left outside mirror (M21/1) and right outside mirror (M21/2) can be folded in and out electrically. This can be done both automatically as well as manually. The left door control unit (N69/1) has the master function during adjustment and relays the corresponding requests to the right door control unit (N69/2) via the interior CAN (CAN-B). If a new adjustment request is recognized while adjustment is in progress, the adjustment is directly switched to the opposite direction.

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

 Function sequence for manual folding in/out

 Automatic folding in/out, function sequence

Function sequence for manual folding in/out

The automatic folding in/out function comprises the following subfunctions:

 Manual folding in function sequence

 Manual folding out function sequence

Additional function requirements for manually folding in

 Outside mirror folded out

 Terminal 15 ON

 Vehicle speed v < 47 km/h

 The status of circuit of circuit 15 is sent by the electronic ignition lock control unit (N73) via interior CAN to the left door control unit.
The instrument cluster (A1) sends the vehicle speed via user interface CAN (CAN HMI), gateway AMG control unit (N93/9) and interior CAN to the left door control unit.

Manual folding in function sequence

By pressing the outside mirror fold in/out switch (S20s9) in the driver side power window and outside mirror adjustment switch group (S20), the two outside mirrors are folded to the garage position. The left door control unit reads in the status of the outside mirror fold-in/out switch via the left door LIN (LIN B5), actuates the outside mirror fold-in/out electric motor (M21/1m3) in the left outside mirror and transmits the request "Fold in right outside mirror" to the right door control unit via the interior CAN. The right door control unit then actuates the outside mirror fold-in/out electric motor (M21/2m3) in the right outside mirror. The actuation duration is t = 5 s.

 After exceeding a speed of v > 47 km/h it is no longer possible to fold in the outside mirrors.

Additional function requirements for manual fold-out

 Outside mirror folded in

 Circuit 15R ON

 The electronic ignition lock control unit transmits the circuit status of circuit 15R to the left door control unit via the interior CAN.

Manual folding out function sequence

Both outside mirrors are folded to the driving position when the outside mirror fold-in/out switch is actuated. The left door control unit reads in the status of the outside mirror fold-in/out switch via the left door LIN, actuates the outside mirror fold-in/out electric motor in the left outside mirror and transmits the request "Fold out right outside mirror" to the right door control unit via the interior CAN. The right door control unit then actuates the outside mirror fold-in/out electric motor in the right outside mirror. The actuation duration is t = 5 s.

Additional function requirements for automatic fold-in/out

 Function activated in head unit (A26/17)

 The head unit sends the status of the outside mirror fold-in/out function via user interface CAN, gateway AMG control unit and interior CAN to the left door control unit.

Automatic folding in/out, function sequence

The automatic folding in/out function comprises the following subfunctions:

 Automatic folding in function sequence

 Automatic folding out function sequence

Additional function requirements for automatic folding in

 Outside mirror folded out

 Circuit 15C OFF

 The electronic ignition lock control unit transmits the circuit status of circuit 15C to the left door control unit via the interior CAN.

Automatic folding in function sequence

When the vehicle is locked with the central locking (CL) from outside both outside mirrors are folded in automatically (garage position). The electronic ignition lock control unit sends the status of the CL to the left door control unit via the interior CAN. The left door control unit actuates the outside mirror fold-in/out electric motor in the left outside mirror and transmits the request "Fold out right outside mirror" to the right door control unit via the interior CAN. The right door control unit then actuates the outside mirror fold-in/out electric motor in the right outside mirror. The actuation duration is t = 5 s.

 The signal flow for locking the vehicle via CL is described in the "Theft protection and locking" function description, "Central locking (CL), function" partial function in detail.

Additional function requirements for automatic folding out

 Outside mirror folded in

 CL locked

Automatic folding out function sequence

When the vehicle is unlocked via the CL and then the driver door opened, both outside mirrors are folded out automatically to the driving position.

The electronic ignition lock control unit sends the status of the CL to the left door control unit via the interior CAN. Opening the driver door is detected by the left door lock rotary tumbler switch (A85s1) in the left door lock (A85). The left door control unit directly reads in the status of the left door lock rotary tumbler switch. The left door control unit actuates the outside mirror fold-in/out electric motor in the left outside mirror and transmits the request "Fold out right outside mirror" to the right door control unit via the interior CAN. The right door control unit then actuates the outside mirror fold-in/out electric motor in the right outside mirror. The actuation duration is t = 5 s.

 If the outside mirrors are still folded in with circuit 15R ON by a previous automatic folding-in procedure, the mirror housings are folded out immediately.

 To ensure that the outside mirrors are really folded out, the outside mirror fold-in/out electric motors are actuated when a speed of v = 47 km/h is exceeded for = 1 s.