Communications Network: Notes
Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing allows 2 or more electronic modules (nodes) to communicate simultaneously over a twisted wire pair [data (+) and data (-)] network. The information or messages that can be communicated on these wires consists 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 connected to the Data Link Connector (DLC) and communicate with the scan tool. The communication networks are:
- High Speed Controller Area Network (HS-CAN)
- Medium Speed Controller Area Network (MS-CAN)
The Infotainment Controller Area Network (I-CAN) is connected to the DLC, but the I-CAN modules communicate with the scan tool over the HS-CAN. The Instrument Panel Cluster (IPC) is used as a gateway module for the messages to transfer between the scan tool and the modules on the I-CAN.
Network Topology
| Module Name | Network Type | Termination Module |
|---|---|---|
| Accessory Protocol Interface Module (APIM) (if equipped) | HS-CAN | No |
| MS-CAN (with 8-inch touchscreen) | No | |
| I-CAN | No | |
| ABS module | HS-CAN | No |
| Audio Front Control Module (ACM) | I-CAN | Yes |
| Body Control Module (BCM) (gateway) | HS-CAN | Yes |
| MS-CAN | Yes | |
| Cruise-Control Module (C-CM) (if equipped) | HS-CAN | No |
| Audio Digital Signal Processing (DSP) module (if equipped) | I-CAN | No |
| Driver Seat Module (DSM) (if equipped) | MS-CAN | No |
| Dual Climate Controlled Seat Module (DCSM) (if equipped) | MS-CAN | No |
| Front Lighting Control Module (FLM) | HS-CAN | No |
| Front Controls Interface Module (FCIM) | I-CAN | No |
| Front Control/Display Interface Module (FCDIM) (if equipped) | I-CAN | No |
| Global Positioning System Module (GPSM) (if equipped) | MS-CAN | No |
| Heated Steering Wheel Module (HSWM) (if equipped) | MS-CAN | No |
| Headlamp Control Module (HCM) (if equipped) | HS-CAN | No |
| Head Up Display (HUD) module (if equipped) | HS-CAN | No |
| HVAC module | MS-CAN | Yes |
| Instrument Panel Cluster (IPC) (gateway module) | HS-CAN | No |
| I-CAN | Yes | |
| Liftgate/Trunk Module (LTM) (if equipped) | MS-CAN | No |
| Occupant Classification System Module (OCSM) | HS-CAN | No |
| Parking Aid Module (PAM) (if equipped) | HS-CAN | No |
| PCM | HS-CAN | Yes |
| Remote Function Actuator (RFA) module (if equipped) | MS-CAN | No |
| Restraints Control Module (RCM) | HS-CAN | No |
| Steering Column Control Module (SCCM) | HS-CAN | No |
| Side Obstacle Detection Control Module - Left (SOD-L) (if equipped) | MS-CAN | No |
| Side Obstacle Detection Control Module - Right (SOD-R) (if equipped) | MS-CAN | No |
| Tire Pressure Monitor (TPM) module (also known as the Radio Transceiver Module [RTM]) | MS-CAN | No |
| Transmission Control Module (TCM) (if equipped) | HS-CAN | No |