For 1990-2009 cars

The data link connector (DLC) contains the following:

• | The UART serial data line (CKT 800)

- | The UART serial data line (CKT 800) allows the following components to communicate data with each other:

• | The powertrain control module (PCM)

• | The inflatable restraint sensing and diagnostic module (SDM)

• | The electronic brake control module (EBCM)

• | The driver information display (DID)

- | The UART serial data line allows a scan tool to communicate with these modules for diagnosis and testing.

• | The class 2 serial data line (CKT 1807)

| The class 2 serial data line allows a scan tool to communicate with the PCM and pass key III module for diagnosis and testing.

• | The E+C serial data line (CKT 835)

| The E+C serial data line allows a scan tool to communicate with the radio for diagnosis and testing.

• | Unswitched voltage (B+) (CKT 440)

• | Ground (CKT 1550)