Right front door control unit, component description - GF72.29-P-4142LE

MODEL 221.0 /1 as of model year 09 /YoM 08 

Location 

The right front door control unit is located on the rear door module behind the door paneling on the right front door.

Task 

The right front door control unit has the following tasks:

• Reading in of sensors, pickups and signals 
• Evaluation of input factors 
• Controlling function sequences 
• Actuation of components 

Reading in of sensors, pickups and signals 

The input factors are read in with the following connections:

• Direct line 
• Front door LIN 
• Interior CAN 

Direct line 

The following sensors are read in via a direct line:

• Hall signals for right front power window motor (M10/4)
• Mirror adjustment up/down potentiometer (M21/2r2) (with code (275) Memory package (driver seat, steering column, mirror))
• Mirror adjustment in/out potentiometer (M21/2r3) (with code (275) Memory package (driver seat, steering column, mirror))

The following switches are read in via a direct line:

• Right front rotary tumbler switch (A85/1s1)
• Right front drive lock pawl switch (A85/1s2)

  (with code (883) Power closing for doors and trunk lid)

• Right front safety limit switch (A85/1s3)

  (with code (883) Power closing for doors and trunk lid)

• Front passenger power window switch (S21/2)

The following signals are read in via a direct line:

• Circuit 30
• Tml. 31

Front door LIN 

The following switches are read in via front door LIN:

• Right front seat operation switch group (S23)
  • Head restraint adjustment switch (S23s1)
  • Seat cushion fore/aft switch (S23s2)
  • Fore/aft, height and inclination adjustment switch (S23s3)
  • Backrest switch (S23s5)
  • Memory switch (S23s6) (with code (275) Memory package (driver seat, steering column, mirror))
  • Memory switch 1 (S23s7) (with code (275) Memory package (driver seat, steering column, mirror))
  • Memory switch 2 (S23s8) (with code (275) Memory package (driver seat, steering column, mirror))
  • Memory switch 3 (S23s9) (with code (275) Memory package (driver seat, steering column, mirror))
  • Left or right seat adjustment selection switch (S23s10)
  • Seat ventilation switch (S23s11) (with code (401) Front comfort seats incl. seat heater and seat ventilation)
  • Seat heater switch (S23s12) (with code (401) Front comfort seats incl. seat heating and seat ventilation)
• Right interior CL switch (S85/6)

Interior CAN 

The signals are read in by the right front door control unit via the interior CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Controlling function sequences 

The right front door control unit controls the following function sequences:

• Outside mirror adjustment
• Blind spot assist indicator (with code (234) Blind spot assist)
• Power window actuation
• Front passenger door interior illumination
• Central locking
• Right additional door lock (with code (833) Great Britain version)

Actuation of components 

• Right front door lock unit (A85/1)

  Right front CL motor (A85/1m1)

  • Right front power closing motor (A85/1m3)

    (with code (883) Power closing for doors and trunk lid)

  • Right front additional door lock motor (A85/1m4)

    (with code (833) Great Britain version)

• Right outside mirror turn signal lamp (E6/6)
• right front door entrance and exit lamp (E17/4)
• Right front door inside handle illumination (E17/12)
• Front right door warning lamp (E17/21)
• Right front door trim strip (E17/44)

  (with code (876) Interior light package)

• Right front power window motor
• Right electrically adjustable and heated outside mirror (M21/2)

  Right outside mirror ambient lamp (M21/2e1)

  • Right Blind spot assist warning indicator (M21/2e2)

    (with code (234) Blind spot assist)

  • Right Blind spot assist indicator lamp (M21/2e3)

    (with code (234) Blind spot assist) (left-hand drive vehicle)

  • Automatic mirror dimming (M21/2h1) (with code (249) Automatically dimming inside rearview mirror and outside mirror (driver))
  • Mirror adjustment up/down motor (M21/2m1)
  • Mirror adjustment up/out motor (M21/2m2)
  • Power folding mirror motor (M21/2m3)
  • Mirror heater (M21/2r1)

Variants 

• Power closing

  (with code (883) Power closing for doors and trunk lid)

• Mirror dimming

  (with code (249) Inside rearview mirror and outside mirror (driver) automatic dipping)

• Additional door lock

  (with code (833) Great Britain version)

Thermal protection for right front power window motor:

The right front door control unit calculates the actuation duration, operating voltage, RPM of the right front power window motor as well as the outside and inside temperature at the bearing points on the right front power window motor to protect the right front power window motor.

After the calculated threshold temperature is reached, the right rear power window motor can only be actuated until the request is no longer present or the end position is reached.

During automatic raising the direction is reversed when the overload protection force limitation is actuated.

It is possible to reactuate the right front power window motor after a cooling phase calculated by the right front door control unit.

Wiring diagram for right front door control unit (DCU)

PE72.29-P-2102-99SAA