Communications Network: Notes
WARNING: This page is about a different car, the 2011 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing is used to allow 2 or more electronic modules (nodes) to communicate simultaneously over a twisted-wire pair [data (+) and data (-)] network. The information or messages are communicated on these wires consist of commands, status or data. The advantage of using multiplexing is to reduce the weight of the vehicle by reducing the number of redundant components and electrical wiring.
The vehicle has 2 module communication networks which are connected to the Data Link Connector (DLC), located under the instrument panel:
- High Speed Controller Area Network (HS-CAN)
- Medium Speed Controller Area Network (MS-CAN)
Network Topology
NETWORK TOPOLOGY
| Module Name | Network Type | Termination Module |
|---|---|---|
| 4X4 control module | HS-CAN | No |
| ABS module | HS-CAN | No |
| Accessory Protocol Interface Module (APIM) | HS-CAN MS-CAN | No No |
| Audio Control Module (ACM) | MS-CAN | No |
| Audio Digital Signal Processing (DSP) module | MS-CAN | No |
| Cruise-Control Module (C-CM) | HS-CAN | No |
| Driver Door Module (DDM) | MS-CAN | No |
| Driver Seat Module (DSM) | MS-CAN | No |
| Dual Climate Controlled Seat Module (DCSM) | MS-CAN | No |
| Front Controls Interface Module (FCIM) | MS-CAN | No |
| Headlamp Control Module (HCM) | HS-CAN | No |
| Headlamp Control Module 2 (HCM-2) | MS-CAN | No |
| Head Up Display (HUD) module | HS-CAN | No |
| HVAC module | MS-CAN | No |
| Instrument Panel Cluster (IPC) (gateway module) | HS-CAN MS-CAN | Yes Yes |
| Interior Lighting Control Module (ILCM) | MS-CAN | No |
| Liftgate/Trunk Module (LTM) | MS-CAN | No |
| Occupant Classification System Module (OCSM) | HS-CAN | No |
| Parking Aid Module (PAM) | HS-CAN | No |
| Passenger Climate Controlled Seat Module (PCSM) | MS-CAN | No |
| PCM | HS-CAN | Yes |
| Power Steering Control Module (PSCM) | HS-CAN | No |
| Rear Entertainment Module (RETM) | MS-CAN | No |
| Rear Heating Ventilation Air Conditioning (RHVAC) module | MS-CAN | No |
| Remote Function Actuator (RFA) module | HS-CAN MS-CAN | No |
| Restraints Control Module (RCM) | HS-CAN | No |
| Side Obstacle Detection Control Module - Left (SOD-L) | MS-CAN | No |
| Side Obstacle Detection Control Module - Right (SOD-R) | MS-CAN | No |
| Smart Junction Box (SJB) | MS-CAN | Yes |
| Steering Angle Sensor Module (SASM) | HS-CAN | No |