Mountaineer RWD V6-4.0L (2008)
Information Bus: Description and Operation
COMMUNICATIONS NETWORK
NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).
Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is used for many modules to
communicate with each other on a common network. CAN in-vehicle networking, is a method for transferring data among distributed electronic modules
via serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive,
complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires, combining the signals on a single network.
Information is sent to the individual control modules that control each function.
The vehicle has 2 module communication networks:
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Medium speed (MS) CAN
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High speed (HS) CAN
Both networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be
able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel between the steering
column and the audio unit.
