With Code 580, 581A

Front SAM Control Module With Fuse and Relay Module, Task
with code 580, 581a
In combination with the automatic air conditioning and comfort automatic air conditioning

Task
On the front SAM control module with fuse and relay module (N10/1) there are two types of input signals:
- Digital signals
- Analog signals

Receives digital signals
The signals are read in either shorter or longer intervals depending on how quickly the processor must react to signal changes. So that the system does not react to short-term disturbances, the front SAM control module with fuse and relay module (N10/1) 3 only takes over changes when the new level value was read in for the second time in succession.

processing incoming analog signals
The power supply to the switches and sensors depends on the present battery voltage.

Before reading in a switch/sensor, the processor first reads the unfiltered battery voltage. If the voltage is within the valid range, the switch can be read in. This voltage is then set in proportion to the switch voltage. So that the system does not react to short-term disturbances, the front SAM control module with fuse and relay module (N10/1) only takes over changes when the new level value was read in for the second time in succession. Sensor values are transferred as physical parameters.

The following sensors are detected:
- Refrigerant temperature
The refrigerant temperature sensor is supplied with 5 V. The sensor ground must be selected jointly for the refrigerant temperature sensor and the refrigerant pressure sensor. The temperature and pressure must also be measured at the same time.
- Refrigerant pressure
The refrigerant pressure is supplied with a stabilized 5 V.

- The sensor ground must be selected jointly for the refrigerant temperature sensor and the refrigerant pressure sensor. The temperature and pressure must also be measured at the same time.
- Outside temperature and the following information which has been read in are made available on the interior CAN:
- Refrigerant compressor on
- Refrigerant compressor actuating signal

Actuating the refrigerant compressor
The output of the refrigerant compressor is controlled steplessly. In order to switch on the refrigerant compressor, the control and operating module for automatic air conditioning or comfort automatic air conditioning sends via the interior CAN the switch-on request and the specified value (0 - 100 %) to the front SAM control module with fuse and relay module (N10/1).

The current of the refrigerant compressor is controlled (100% corresponds to 1). At the same time the refrigerant compressor torque to be expected is conveyed via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) or to the CDI control module (N3/9) and to the ETC [EGS] control module (N15/3). The front SAM control module with fuse and relay module (N10/1) sends the load increase signal via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) or to the CDI control module (N3/9) and switches on the refrigerant compressor after a defined time delay (approx. t = 450 ms).
In order to switch off the refrigerant compressor, the control and operating module for automatic air conditioning or comfort automatic air conditioning sends via the interior CAN the switch-on request and the specified value = 0 % to the front SAM control module with fuse and relay module (N10/1).
Simultaneous the refrigerant compressor torque is set to the value 0 and conveyed via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) or to the CDI control module (N3/9) and the ETC [EGS] control module (N15/3).

The front SAM control module with fuse and relay module (N10/1) sends the erased load increase signal via the electronic ignition switch control module (N73) to the motor electronics control module (N3/10) or to the CDI control module (N3/9) and switches off the refrigerant compressor after a defined delay (approx. 450 ms).
During brisk acceleration and upon request from the motor electronics control module (N3/10) or the CDI control module (N3/9) for a defined time (max. t = 10 s) from the front SAM control module with fuse and relay module (N10/1) the refrigerant compressor is regulated directly to half the request of the control and operating module automatic for air conditioning or comfort automatic air conditioning. The air conditioning or comfort air conditioning pushbutton control module receives the acceleration signal as information.
If the engine fan is defective and there is a simultaneous cooling problem (too high an engine temperature) the motor electronics control module (N3/10) or CDI control module (N3/9) requests an emergency shut-off of the refrigerant compressor from the control and operating module for automatic air conditioning, comfort automatic air conditioning or from SAM with front fuse and relay module (N10/1).

Actuating the heater water circulation pump
Upon request from the control and operating module the coolant circulation pump is actuated by the front SAM control module with fuse and relay module (N10/1). It feeds back the status to the control and operating module of the automatic air conditioning or comfort automatic air conditioning.
Under certain operating conditions and also when the ignition is switched off, switching on the coolant circulation pump is requested by the control and operating module for the automatic air conditioning or comfort automatic air conditioning (z. g. engine residual heat utilization).
The coolant circulation pump is switched off by the control and operating module for automatic air conditioning or comfort automatic air conditioning after t = 30 seconds and after = 5 seconds.

Measuring the outside temperature
The outside temperature display temperature sensor (B14) detects the temperature of the outside air and passes on this value to the SAM with front fuse and relay module (N10/1).
The value is placed on the interior CAN where it can be read in by the control and operating module for automatic air conditioning or comfort automatic air conditioning and used to control the automatic heater.