Power Door Serial Data Line

The power door serial data line does not communicate with the scan tool via the DLC. Power door serial data information is interpreted by the Driver Door Module (DDM) and transmitted on the Class 2 data line by the DDM. The power door serial data line is used for serial data communication between the door modules as well as the window switch driver. In order to diagnose the door lock serial data line, refer to DOOR SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.