Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Communications Network: Notes
Vehicle communication utilizes a high speed controller area network (HS-CAN), International Standards Organization (ISO) 9141 network and universal asynchronous receiver-transmitter (UART)-based protocol (UBP) network. Information is sent to and from individual control modules that each control specific functions. All 3 networks are connected to the data link connector (DLC). The DLC can be found under the instrument panel between the steering column and the audio unit.
The 3 module communication networks are:
- High speed (HS) CAN
- ISO 9141
- UBP
ISO 9141 is for diagnostic use only while UBP and CAN allow multiple modules to communicate, or transfer data, with each other on a common network.
| Module Name | Network Type | Termination Module |
|---|---|---|
| Anti-lock brake system (ABS) module | HS-CAN | No |
| Driver seat module (DSM) (if equipped) | UBP | N/A |
| Electronic automatic temperature control (EATC) module (if equipped) | UBP | N/A |
| Instrument cluster (IC) (gateway module) | HS-CAN UBP |
Yes N/A |
| Parking aid module (PAM) (if equipped) | ISO 9141 | N/A |
| Powertrain control module (PCM) | HS-CAN | Yes |
| Restraints control module (RCM) | ISO 9141 | N/A |
| Vehicle security module (VSM) (if equipped) | UBP | N/A |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.