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Front SAM Control Unit With Fuse And Relay Module, Component Description - GF54.21-P-6070RR

Model 190 

View of front SAM control unit with fuse and relay module (N10/1) 

G16682149Courtesy of MERCEDES-BENZ USA

Location 

The front SAM control unit with fuse and relay module is located at the front in the front passenger footwell.

Tasks 

Two microprocessors are installed in the front SAM control unit with fuse and relay module, one for control of basic functions, e.g. the exterior lights, and the second for control of the central gateway functions. Both processors communicate internally with each other over the interior CAN (CAN B) and they can undergo separate diagnosis.

The front SAM control unit wit fuse and relay module also has an 3D acceleration sensor integrated into it which is used to detect any crash events.

The processor for controlling the central gateway-functions has the following tasks:

The processor responsible for controlling the basic functions has the following tasks:

The fuse and relay module of the front SAM control unit supplies various systems and control units with power via limit switches, depending on the function sequence in question.

In this context, the following tasks are performed by the fuse and relay module:

Central gateway (interface CAN) 

The processor for controlling the central gateway functions also acts as an interface between the following data bus systems:

Data container 

The data container is a nonvolatile, mobile data memory and is managed by the processor for controlling the central gateway functions.

Use: During production, data specific to the vehicle, test location and control units (e.g. production number, test status, partial tests not completed) are stored in the data container. These data can be used in the subsequent tests for test sequence control. The total size of the data memory is 128 bytes.

System diagnosis 

The system diagnosis is integrated as a software module into the processor for controlling central gateway functions.

For off-board diagnosis, the following on-board functions are realized by the processor responsible for controlling the central gateway functions:

Global variant coding 

The processor responsible for controlling the central gateway functions sends global information such as Model series and national version via the various CAN buses to the networked control units. The control units perform part of their configuration process to match this information.

Monitoring of the CAN bus idle 

The monitoring of the CAN bus idle enables control units to be determined, which keep the CAN bus active at what otherwise is expected to be a CAN bus idle period. This information is filed in a nonvolatile memory. This in turn serves to ensure that even when the on-board electrical system battery (G1) has been discharged and following a reset of the networked control units, it is still possible to determine whether the discharging of the on-board electrical system battery was caused by the network or by an individual CAN user.

Interior CAN and LIN interface 

The processor for controlling the basic functions also acts as an interface between the following bus systems:

Reading in of signals 

The input factors are read in over the following connections:

Direct line 

The processor for actuating the base functions reads in the signals of the following components over direct lines:

Instrument panel LIN 

The signals from the upper control panel control unit (N72/1) are read in via the instrument panel LIN.

Wiper/inside rear-view mirror LIN 

The processor responsible for controlling the basic functions reads in the signals from the following components over a wiper/inside rear-view mirror LIN:

IMPORTANT The communication with the processor responsible for controlling the central gateway functions can also send the data read in by the processor responsible for controlling the basic functions to control units that are not connected to the interior CAN.

Interior CAN 

The processor responsible for controlling the basic functions reads in function relevant data over the interior CAN.

Information from control units that are not connected to the interior CAN are sent by the processor responsible for controlling the central gateway functions over the interior CAN.

Evaluation of input factors 

The input factors are evaluated by the processor responsible for controlling the basic functions whereupon the corresponding components are then actuated.

Controlling functions 

The processor responsible for controlling the basic functions manages the following functions:

Actuation of components 

The actuation of the components takes place via the following connections:

Direct line 

The following components are actuated over direct lines by the processor responsible for controlling the basic functions:

Instrument panel LIN 

The following component is actuated over an instrument panel LIN by the processor responsible for controlling the basic functions:

Wiper/inside rear-view mirror LIN 

The following components are actuated over a wiper/inside rear-view mirror-LIN by the processor responsible for controlling the basic functions:

  Wiring diagram for front SAM control unit with fuse and relay module (N10/1) Model 190 Sheet 1 PE54.21-P-2106-97HBA
    Model 190 Sheet 2 PE54.21-P-2106-97HBB
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