Principles of Operation: Notes

The vehicle has 4 module communications networks:

• controller area network (CAN)
• standard corporate protocol (SCP) communications network
• international standards organization (ISO) 9141 communications network
• universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network

The diagnostic tool connects to the communications networks through the data link connector (DLC). The DLC allows a diagnostic tool access to diagnose and test the vehicle systems of any module on the communications networks.

All 4 communications networks are connected to the DLC. This makes diagnosis and testing of these systems easier by allowing one diagnostic tool to be able to diagnose and control any module on the 4 communications networks from one common connector. The DLC can be found under the instrument panel between the steering column and the driver door.