Communications Network: Notes
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 a 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:
- Medium speed controller area network (MS-CAN)
- High speed controller area network (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 control module (ACM).
| Module Name | Network Type | Termination Module |
|---|---|---|
| Audio control module (ACM) | MS-CAN | No |
| Audio digital signal processing (DSP) module (Navigator only) | MS-CAN | No |
| Audio rear control unit (RCU) (if equipped) | MS-CAN | No |
| ABS module | HS-CAN | No |
| Driver seat module (DSM) (if equipped) | MS-CAN | No |
| Dual climate controlled seat module (DCSM) (if equipped) | MS-CAN | No |
| Heating ventilation air conditioning (HVAC) module | MS-CAN | No |
| Instrument cluster (IC) (gateway module) | HS-CAN MS-CAN |
Yes Yes |
| Liftgate/trunk module (LTM) (if equipped) | MS-CAN | No |
| Parking aid module (PAM) (if equipped) | MS-CAN | No |
| Power running board (PRB) module (if equipped) | MS-CAN | No |
| PCM | HS-CAN | Yes |
| Rear entertainment module (RETM) (if equipped) | MS-CAN | No |
| Restraints control module (RCM) | HS-CAN | No |
| Smart junction box (SJB) | MS-CAN | Yes |
| Satellite digital audio receiver system (SDARS) module (if equipped) | MS-CAN | No |
| Transmission control module (TCM) | HS-CAN | No |
| Vehicle dynamics module (VDM) (if equipped) | HS-CAN | No |
| 4X4 control module (if equipped) | HS-CAN | No |