Model 205.0/1/3, shown on model 205.0 up to May 31, 2018 |
N121 | Trunk lid control control unit |
P80.20-3801-04
Location
The control unit for the trunk lid control is located at the left in the trunk close to the C-pillar between an intermediate panel and the panel.
Model 253.3 as of 01.06.2019 |
N121/1 | Tailgate control control unit |
P80.20-A002-04
Model 205.2, 253 (except model 253.3 as from June 1, 2019), shown on model 205.2 up to May 31, 2018 |
N121/1 | Tailgate control control unit |
P80.20-3807-04
Location
The liftgate control unit fasten at the top left in the load compartment under the cover (except model 253.3 as from June 1, 2019). For model 253.3, the liftgate control unit as from June 1, 2019 is installed in the liftgate behind the trim, above the brand emblem.
Tasks
The trunk lid control unit or liftgate control unit has the following tasks:
Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Reading in of sensors and signals
The input factors are read in via the following connections:
Direct line
Interior CAN (CAN B)
Direct line
The signals from the following components are read via direct lines:
Trunk lid/liftgate control Hall sensor (M51/3b1) (model 205.2, 253)
Trunk lid/liftgate control position sensor (M51/3b2) (model 205.0/1/3)
Interior CAN
The following signals, among others, are read in via interior CAN:
Vehicle speed (from instrument cluster (A1))
Status of driver trunk lid/liftgate control button (S15/3) (left front door control unit (N69/1))
Status of trunk lid/liftgate lock (rear SAM control unit (N10/8))
Status of trunk lid/liftgate control button (S62/26) (rear SAM control unit)
Circuit 15 status from electronic ignition lock control unit (N73)
Status of open trunk lid/liftgate control button on transmitter key (A8/1) (electronic ignition lock control unit)
Status of rear switching module (N38) (with code 871 (HANDS-FREE ACCESS))
Status of opening angle limit (electronic ignition lock control unit)
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.
Actuation of components
The components are actuated via direct lines.
The following components are actuated via direct lines:
Trunk lid/liftgate control warning buzzer (H4/60)
Trunk lid/liftgate control electric motor (M51/3m1)
Wiring diagram for trunk lid control control unit | Model 205.0/1/3 as of model year 2019 with code 881 (Remote boot-lid closing)Control unit N121 | ||
Model 205.0/1/3 up to model year 2019 with code 881 (Remote boot-lid closing)Control unit N121 | |||
Wiring diagram for liftgate control unit | Model 253 as of model year 2019 with code 890 (Automatic rear-end door) with code ME02 (Fuel cell)Control unit N121/1 | ||
Model 205.2 as of model year 2019 with code 890 (Automatic rear-end door)Control unit N121/1 | |||
Model 205.2 up to model year 2019 with code 890 (Automatic rear-end door)Control unit N121/1Model 253 (except 253.99) with code 890 (Automatic rear-end door) |