UART Serial Data Link
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
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.