Function requirements, general
No overvoltage or undervoltage
Fold down outside mirror, general
The left outside mirror (M211) and right outside mirror (M212) 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 manual folding in/out
The partial function manual fold-in/out 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 15R 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) transmits the vehicle speed to the left front door control unit via the interior CAN.
Manual folding in function sequence
By pressing the outside mirror fold in/out switch (S20s9) in the driver power window and outside mirrors adjustment switch group (S20), the two outside mirror housings can be folded in (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 transmits the corresponding status via interior CAN to the left front door control unit.
Automatic folding in/out, function sequence
The partial function automatic fold-in/out comprises the following subfunctions:
Automatic folding in function sequence
Automatic folding out function sequence
Additional function requirements for automatic folding in
Outside mirror folded in
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.
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. Opening the driver door is detected by the left front door rotary tumbler switch (A85s1) in the left front door lock (A85). The left front door control unit directly reads in the status of the left front door rotary tumbler switch. 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.
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.
Referenced documents
- gf8879p9996kn Overview of system components for electric mirror