Principles of Operation: Notes

The vehicle has 4 module communications networks:

• Standard corporate protocol (SCP) communications network.
• International standards organization (ISO) 9141 communications network.
• Universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network.
• High speed controller area network (CAN).

The diagnostic tool connects to all 4 communications networks through the data link connector (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 connector. The DLC is found under the instrument panel between the steering column and the radio.