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 front door control unit (N69/1) has the master function during adjustment and relays the corresponding requests to the right front door control unit (N69/2) via the interior CAN (CAN-B).
If a new adjustment request is recognized while adjustment is in progress, the active adjustment is directly switched to the opposite direction.
The outside mirror fold-down function comprises the following partial functions:
Function sequence for manual folding in/out
Automatic folding in/out, function sequence
Function sequence for automatic fold-out via speed signal
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
Circuit 15 ON
Vehicle speed v < 47 km/h
The electronic ignition lock control unit (N73) sends the status of circuit 15 to left front door control unit via interior CAN.
The instrument cluster (A1) sends the vehicle speed via user interface CAN (CAN HMI), electronic ignition lock control unit and interior CAN to the right front door control unit.
Manual folding in function sequence
By pressing the outside mirror fold in/out switch (S20s6) 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 front door control unit reads in the status of the outside mirror fold-in/out switch via the left front 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 front 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.
Additional function requirements for manual fold-out
Outside mirror folded in
Circuit 15R ON
The electronic ignition lock control unit sends the status of circuit 15 to left front 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 front door control unit reads in the status of the outside mirror fold-in/out switch via the left front 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 front door control unit via the interior CAN. The right front 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 instrument cluster
The instrument cluster sends the corresponding status to the left front SAM control unit over the user interface CAN, electronic ignition lock control unit and interior CAN.
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 automatically folding in
Outside mirror folded out
Circuit 15C OFF
The electronic ignition lock control unit sends the status of circuit 15 to left front 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 central locking to the left door control unit via the interior CAN.
The left front door control unit actuates the outside mirror fold-in/out electric motor in the left outside mirror and transmits the request "Fold in right outside mirror" to the right front door control unit via the interior CAN. The right front 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 central locking to the left door control unit via the interior CAN.
The left front door control unit records the status of the driver door.
The left front 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 front door control unit via the interior CAN. The right front 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.
Additional function requirements for automatic fold-out via speed signal
Outside mirror folded in
Status of circuit 15C changes to circuit 15 On
The electronic ignition lock control unit sends the status of circuit 15 to left front door control unit via the interior CAN.
Function sequence for automatic fold-out via speed signal
The outside mirrors are folded out automatically when the vehicle speed v exceeds 47 km/h.
The instrument cluster sends the vehicle speed to the left front door control unit via user interface CAN, electronic ignition lock control unit and interior CAN.
The left front 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 front door control unit via the interior CAN. The right front 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.
After exceeding a speed of v > 47 km/h is no longer possible to fold in the outside mirrors.
Referenced documents
- gf8879p9996lf Overview of system components for electric mirror