Component Description For Trailer Recognition Control Unit - GF31.19-P-4050GWM
Model 463 (except 463.342)
as of model year 2019
Show on model 463
Location
The trailer recognition control unit is located on the left under the load compartment cover.
Tasks
The trailer recognition control unit has the following tasks:
- Reading in of signals
- Evaluation of input factors
- Trailer recognition
- Trailer consumer actuation
- Lamp failure indicator
- Emergency light function
- Consumer shutoff
Reading in of signals
The signals are read in by the trailer recognition control unit via the interior CAN.
Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding components are actuated.
Trailer recognition
The trailer recognition control unit monitors the current of the "left turn signal" and "brake lights" output, to determine whether trailer hitch supply line is plugged in or not. When one of the two loads is recognized, the trailer is deemed to be recognized. This status is sent via the interior CAN.
Trailer consumer actuation
The trailer recognition control unit actuates the following trailer components via the trailer socket:
- Brake light
- Rear fog lamp
- Backup lamp
- Turn signal lamp
- Taillight and license plate lamp
Lamp failure indicator
The trailer recognition control unit monitors the function of the light sources on the trailer. However, only faults in the complete path are detected. If a failure is detected, a corresponding signal is sent over the interior CAN.
LED version trailer lighting: The minimum current for each lamp path must be I = 50 mA for reliable lamp failure detection. If this minimum current is not reached, a fault message appears in the instrument cluster even if the trailer lighting is functioning correctly.
Emergency light function
If the trailer recognition control unit fails or if there is a corresponding request placed via the interior CAN, the trailer's taillights are actuated.
Consumer shutoff
If requested by the rear SAM control unit (N10/8), circuit 30 to the trailer socket is switched off. The lighting system of the trailer is not actuated.
| Trailer recognition control unit wiring diagram | PE31.19-P-2101-97ZHA |