Fold left/right outside mirror, function - GF88.79-P-2002FQ
MODEL 218 with CODE 249 (Automatically dimming inside rearview mirror and outside mirror including fold-in outside mirrors)
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 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 automatic fold-out via speed signal
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 out
- 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 actuation duration is t = 5 s.
The signal for locking the vehicle via CL is described in the function description "Central locking (CL) 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 with CL (driving position) and the driver door is opened both mirror housings are folded out automatically to the previous 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 directly reads in the status of the rotary tumbler switch. The left front door control unit actuates the left outside mirror fold-in/fold-out electric motor in the left outside mirror and transmits the request "Fold out right outside mirror" via the interior CAN to the right front door unit. The right front door control unit then actuates the outside mirror fold-in/fold-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 transmits the vehicle speed to the left front door control unit via the interior CAN. The left front door control unit actuates the left outside mirror fold-in/fold-out electric motor in the left outside mirror and transmits the request "Fold out right outside mirror" via the interior CAN to the right front door unit. The right front door control unit then actuates the outside mirror fold-in/fold-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.
| Electrical function schematic for folding outside mirrors | PE88.79-P-2057-97XAA |
| Overview of system components for electric mirror | GF88.79-P-9996FQ |