Electrical
3
S023074 PA1
2020-05-12
47
Control Module Description
Central Electronic Module (CEM) Handles the vehicle’s body systems, such as
lighting, climate control and locking. Parking
Assistance Module (PAM) is included in
Central Electronic Module (CEM).
Driver Information Module (DIM) Handles visual driver information.
Infotainment Head Unit (IHU) Handles the infotainment system.
Vehicle Connectivity Module (VCM) Handles the connections of the diagnostic
tool.
The electrical connection between each module, the BUS, is in the form of a twisted pair of
wires. Twisting the wires together reduces interference caused by other systems and thus
makes the transfer of data more reliable, particularly for safety critical systems.
Controller Area Network (CAN)
The CAN networks are connected to the modules that use the Flexray network and use a similar
twisted pair BUS design. Data transfer speeds on the CAN networks are slightly slower than the
Flexray network at 500 kbit/s. CAN is divided into six networks.
Domain Network Domain Master
Chassis CAN Vehicle Dynamics Domain Master (VDDM)
Propulsion CAN Vehicle Dynamics Domain Master (VDDM)
Safety CAN protected Supplementary Restraint System (SRS)
Safety CAN exposed Active Safety Domain Master (ASDM)
Body CAN Central Electronic Module (CEM)
Body CAN exposed Central Electronic Module (CEM)
Local Interconnect Network (LIN)
The LIN networks use a serial communication protocol on a single wire between a master
module and one or more slave components. These networks support multiplex communication,
which means that several components can communicate on the same wire without disturbing
each other. An example of this network type is the connection between the driver’s door module
(DDM) and the driver’s door switches (DDS). The transfer rate on the LIN networks is 19.2
kbit/s.
Media Oriented Systems Transport (MOST)
The MOST network is used for the multimedia application between the Infotainment Head Unit
(IHU) and the Audio Control Module (AUD). It sends and receives information on a single fibre
optic cable at a transfer rate of 150 Mbit/s.
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