FORD FCSD TECHNICAL TRAINING FCS-14000-DL - Manual (Page 108)

LESSON 4: ELECTRICAL
Communication Protocols
The 2005 Expedition and Navigator feature the following comunication protocols:
• Medium Speed Controller Area Network (MS-CAN)
The MS-CAN has an unshielded twisted pair cable. The MS-CAN is used for the Vehicle Dynamics Module
(VDM), the Dual Climate Control Seat Module (CCSM), the Dual Automatic Temperature Control (DATC)
module, the instrument cluster, the Parking Aid Module (PAM), Liftgate/Trunk Module (LTM), and the Vehicle
Security Module (VSM) communications. The MS-CAN remains operational even with the severing of one of the
MS-CAN circuits. Communication also continues if one of the MS-CAN circuits are shorted to ground or
voltage, or if some, but not all, termination resistors are lost.
• High Speed Controller Area Network (HS-CAN).
The HS-CAN has an unshielded twisted pair cable. The HS-CAN is a high speed communications network used
for the Anti-lock Brake System (ABS) module, the instrument cluster, the Transmission Control Module (TCM)
and the Powertrain Control Module (PCM) communication. The HS-CAN remains operational even with the
severing of one of the HS-CAN circuits. Communication also continues if one of the HS-CAN circuits are shorted
to ground or voltage, or if some, but not all, termination resistors are lost.
• ISO9141 Network.
The ISO 9141 communications network is a single circuit communications network. The ISO 9141
communications network does not permit intermodule communication. When the diagnostic tool communicates to
modules on the ISO 9141 communications network, the diagnostic tool must request all information, or initiate
module commands. The ISO 9141 communications network does not function if the circuit is shorted to ground or
battery voltage. Also, if one of the modules on the ISO 9141 communications network loses power or shorts
internally, communications to that module will fail.
• Standard Corporate Protocol (SCP) Network.
The SCP communications network (Navigator with navigation system only) remains operational even if one of
the SCP communications network circuits are severed. Communications also continue if one of the SCP
communications network circuits are shorted to ground or voltage, or if some, but not all termination resistors are
lost. The SCP communications network allows inter-module communication.
Module Programability
• Many of the Body Modules on the 2005 Expedition/Navigator are flash capable at the dealership level. Body
module flash capability will be coming to dealerships in the Fall of 2005. These modules are the Global
Driver’s Seat Module, the Dual Climate Control Seat Module, the Vehicle Security Module, and the
Instrument Cluster. Delivery methods for module updates will be the same as those used currently - CDs and
FORDSTAR.
2005 Expedition/Navigator New Model Technician Training 02-SEP-04 4-8