E 550 Coupe (207.372) V8-5.5L (273.966) (2010)
Relay Box: Description and Operation
GF54.21-P-6070CA Front SAM Control Unit With Fuse and Relay Module, Component Description
GF54.21-P-6070CA Front SAM Control Unit With Fuse And Relay Module, Component Description
Component Identification
Location
The front SAM control unit is located in the left of the engine compartment.
Task
Located in the front SAM control unit are two microprocessors, one for control of basic functions such as, e.g. the exterior lights (ABL) 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 also has an acceleration sensor integrated into it, which is used to detect any crash events.
The processor is responsible for the following tasks for controlling the central gateway functions:
^
Central gateway (Controller Area Network interface (data bus/CAN bus) (CAN))
^
Data container
^
System diagnosis
^
Global variant coding
^
Monitoring CAN bus idle
The processor is responsible for the following tasks for controlling
the basic functions:
^
Interior CAN and local interconnect network (LIN) interface
^
Reading in of sensors, pickups and signals
^
Evaluating input factors
^
Control of systems
^
Actuating components
The fuse and relay module of the front SAM control unit supplies various systems and control units with power through limit switches to match the
function sequence.
The following tasks are the responsibility of the fuse and relay
module:
^
Voltage supply to components
^
Power supply and relay switching
^
Switching consumers using relays
Central gateway (CAN interface)
The processor for controlling the central gateway functions also acts as an interface between the following databus systems:
-
Interior CAN
-
Diagnostic CAN (CAN D)