Driver-side front door control unit, component description - GF72.29-P-6000SC

MODEL 216.3 up to Model Year 8

Fig 1: Locating Left Door Control Module

Courtesy of MERCEDES-BENZ USA

Location

The left door control unit is located on the rear door module behind the door trim.

General

The left door control unit is connected to the interior CAN for data exchange.

Task

The left door control unit reads in the following sensors and switches, actuates their function and switch and controls illumination, if applicable, and switches the following loads via semi-conductor switches.

Actuation of loads via semi-conductor switches

Left CL motor (A85m1)
Left power closing motor (A85m3)
Left additional door lock motor (A85m4) (only
Left outside mirror turn signal lamp (E6/5)
Entrance and exit lamp in left door (E17/3)
Left door inside handle illumination (E17/11)
(with code (876) Interior lights package)
Left door trim strip illumination (E17/43)
(with code (876) Interior lights package)
Left front power window motor (M10/3)
Left outside mirror ambient lamp (M21/1e1)
Automatic dimming mirror (M21/1h1)
Mirror up/down adjustment motor (M21/1m1)
Mirror in/out adjustment motor (M21/1m2)
Mirror fold-in motor (M21/1m3)
Mirror heater (M21/1r1)

Discrete inputs

Circuit 30
Circuit 30g
Circuit 31
Left rotary tumbler switch (A85s1)
Left drive lock pawl switch (A85s2)
Left safety limit switch (A85s3)
Driver door infrared sensor (B58)
Mirror up/down adjustment potentiometer (M21/1r2)
Mirror in/out adjustment potentiometer (M21/1r3)
Hall sensors for left front power window motor

Read in following switches via front door LIN

Driver power window outside mirror and trunk lid switch group (S20/1)
Left front seat operation switch group (S22)
Left interior CL [ZV] switch (S85/5)

Thermal protection for left front power window motor

The left door control unit calculates the actuation duration, operating voltage, RPM of the left front power window motor as well as the outside and inside temperature at the bearing points on the left front power window motor to protect the left front power window motor. When a temperature of T = 85 °C is reached, the left front power window motor is actuated only as long as the request is present or the end position is reached.

During automatic raising it is still possible to reverse directions when the overload protection force limitation is actuated. It is possible to reactuate the left front power window motor after a cooling phase calculated by the left door control unit.