Data Link Communications: Notes
Regulations and agreements among automobile manufacturers have resulted in Data Link Connector (DLC). This connector must be used for scan tool and programming access to all vehicle communications systems used for those purposes. Connector must have:
- A 16-pin connector configuration to which all scan tools connect.
- Scan tool battery power always available at pin 16.
- Scan tool ground always available at pin 4.
- A clean signal ground always available at pin 5.
Serial data circuits are the means by which microprocessor controlled modules in vehicle communicate with each other and scan tool. The 4 different types of protocols on this vehicle are:
- Class 2.
- Controller Area Network (CAN).
- Keyword 82.
- Keyword 2000.