F 150 4WD V8-5.4L Flex Fuel (2008)
Information Bus: Description and Operation
COMMUNICATIONS NETWORK
Vehicle communication utilizes a high speed controller area network (HS-CAN), International Standards Organization (ISO) 9141 network and universal
asynchronous receiver-transmitter (UART)-based protocol (UBP) network. Information is sent to and from individual control modules that each control
specific functions. All 3 networks are connected to the data link connector (DLC). The DLC can be found under the instrument panel between the
steering column and the audio control module (ACM).
The 3 module communication networks are:
-
High speed (HS) CAN
-
ISO 9141
-
UBP
ISO 9141 is for diagnostic use only while UBP and CAN allow multiple modules to communicate, or transfer data, with each other on a common
network.
NOTE: The ACM, rear entertainment module (RETM) and satellite digital audio receiver system (SDARS) module communicate on a non-standard
medium speed controller area network (MS-CAN) bus which cannot be accessed by the IDS through the data link connector (DLC).
Network Topology