Power Trunk / Liftgate Control Module: Description and Operation

GF80.20-P-6082FL Liftgate Control Unit, Component Description

MODEL 212.2







N121/1 Tailgate control control unit

Location
The liftgate control unit is fastened in the cargo area below the cover.

Task The liftgate control unit has the following purposes:
- Reading in of sensors, pickups and signals
- Evaluation of input factors
- Actuation of components

Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
- Direct line
- Interior CAN (CAN B)

Direct line
The signals from the following components are read via a direct line:
- Liftgate control Hall sensor (M51/3b1)
- Liftgate control position sensor (M51/3b2)

Interior CAN
The following signals are read in over the interior CAN:
By the left front door control unit (N69/1):
- Status of driver liftgate control button (S15/3)

by the rear SAM control unit with fuse and relay module (N10/2):
- Status of liftgate rotary tumbler switch (M14/7s1)
- Status of liftgate control button (S62/36)
- Status of liftgate external operation switch (S88/8)
- Access authorization for transmitter key (A8/1) via FM 1, AM, CL and KEYLESS-GO antenna amplifier (A2/18)

From the instrument cluster (A1):
- Vehicle speed signal

by the electronic ignition switch control unit (N73):
- Circuit status circuit 15

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

Actuation of components
The actuation of the components takes place via the following connections:
- Direct line
- Interior CAN

Direct line
The following components are actuated with a direct line:
- Liftgate control warning buzzer (H4/60)
- Liftgate control electric motor (M51/3m1)
- Liftgate control magnetic clutch (M51/3y1)

Interior CAN
The following component is actuated via the interior CAN:
By the rear SAM control unit:
- Liftgate locking element (M14/31)