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 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 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

 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

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.

 If a speed of v = 47 km/h is exceeded, the corresponding front door control unit actuates the outside mirror fold-in/out motor in the folding out direction for approx. t = 1 s. This ensures that the outside mirror is really folded out.

Additional function requirements for automatic fold-in/out

 Function activated in instrument cluster

 The instrument cluster transmits the corresponding status via the interior CAN to the front 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

 Function sequence for automatic fold-out via speed signal

Additional function requirements for automatically folding in

 Circuit 15C OFF

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 actuates takes place for approx. 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

Both mirror housings are folded out automatically to the previous position (drive position) when the vehicle is unlocked via CL [ZV] and the driver door is then opened.

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 (open or closed).

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 actuates takes place for approx. 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.

 If a speed of v = 47 km/h is exceeded, the corresponding front door control unit actuates the outside mirror fold-in/out motor in the folding out direction for approx. t = 1 s. This ensures that the outside mirror is really folded out.

Additional function requirements for automatic fold-out via speed signal

 Outside mirror folded in

 Status of circuit 15C changes to circuit 15 On

Function sequence for automatic fold-out via speed signal

If the vehicle speed is v > 47 km/h, the outside mirrors are folded out automatically.

The instrument cluster transmits the vehicle speed to the left front 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 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 time is t = 1 s.

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