The DLC is a standardized 16 way connector located below the instrument panel and close to the steering column. Both the connector design and location are dictated by industry wide agreement to follow SAE J1962 standards.
All DLCs are required to provide a power supply, hot at all times, to Pin 16. This circuit is used to power the scan tool. All DLCs provide a power ground at Pin 4 and a clean signal ground at Pin 5.
The class 2 serial data communications circuit is provided at Pin 2 of the DLC.
The class 2 serial data link allows the following modules to communicate and share data with each other:
• | Powertrain control module (PCM) |
• | Inflatable restraint sensing and diagnostic module (SDM) |
• | Theft deterrent control module |
• | Vehicle interface unit (VIU) |
The class 2 serial data link allows a scan tool to communicate with the above modules for diagnostic and testing purposes.
The UART serial data communications circuit is provided at Pin 9 of the DLC.
The UART serial data link is a master/slave configuration with the PCM being the master module and all other UART modules being slave modules.
The UART serial data link allows the following modules to communicate and share data with each other:
• | Driver information center (DIC) |
• | Powertrain control module (PCM) |
• | Electronic brake control module (EBCM) |
The PCM uses class 2 serial data link for diagnostics and testing of the modules on the UART serial data circuit.
The E and C serial data communications circuit is provided at Pin 14 of the DLC.
The E and C serial data link allows the following modules to communicate and share data with each other:
• | Radio |
• | Heads up display (HUD) |
• | Vehicle Interface Unit (VIU) |