E 450 V10-6.8L (2008)
Information Bus: Description and Operation
COMMUNICATIONS NETWORK
Vehicle communication utilizes the International Standards Organization (ISO) 9141 network, the medium speed controller area network (MS-CAN),
and the high speed controller area network (HS-CAN). Information is sent to and from individual control modules that control specific functions. All 3
networks are connected to the data link connector (DLC). The DLC can be found under the steering column.
The 3 module communication networks are:
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ISO 9141
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Medium speed (MS) CAN
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High speed (HS) CAN
Network Topology
ISO 9141 Network Operation
The ISO 9141 communication network is a single wire network, used for diagnostic purposes only.
The ISO 9141 communication network is used for the following modules:
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Parking aid module (PAM) (if equipped)
MS-CAN Operation
The MS-CAN communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In
addition to scan tool communication, this network allows sharing of information between all modules on the network.