Communications Network: Notes
Vehicle communication utilizes both the 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 (MS) CAN
- High Speed (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 |
|---|---|---|
| Accessory Protocol Interface Module (APIM) (if equipped) | HS-CAN MS-CAN |
No No |
| Audio control module (ACM) | MS-CAN | No |
| Audio Digital Signal Processing (DSP) module (if equipped) | MS-CAN | No |
| ABS module | HS-CAN | No |
| Driver seat module (DSM) (if equipped) | MS-CAN | No |
| Dual Climate Control Seat Module (DCSM) (if equipped) | MS-CAN | No |
| 4X4 control module (if equipped) | HS-CAN | No |
| Headlamp Control Module (HCM) (if equipped) | HS-CAN | No |
| HVAC module (if equipped) | MS-CAN | No |
| Instrument cluster (IC) (gateway module) | HS-CAN MS-CAN |
Yes Yes |
| Liftgate/trunk module (LTM) (if equipped) | MS-CAN | No |
| Occupant classification system module (OCSM) | HS-CAN | No |
| Parking aid module (PAM) (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 |
| Satellite digital audio receiver system (SDARS) module (if equipped) | MS-CAN | No |
| Smart junction box (SJB) | MS-CAN | Yes |
| Steering angle sensor module (SASM) (if equipped) | HS-CAN | No |