Data Link Communications

DATA LINK CONNECTOR (DLC)
The Data Link Connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following:
^ Scan tool power battery positive voltage at terminal 16.
^ Scan tool power ground at terminal 4.
^ Common signal ground at terminal 5.
^ Class 2 serial data at terminal 2.

The scan tool will power up with the ignition off. Some modules however, will not communicate unless the ignition is on and the Power Mode Master (PMM) module sends the appropriate power mode message.

CLASS 2 SERIAL DATA LINK
The data link is configured as a ring with discrete lines entering and leaving each module. This allows communications to the modules on the ring if one of the two discrete circuits is open.

A total list of the control modules on the Class 2 Serial Data Line can include the following:
^ Dash Integration Module (DIM)
^ Driver Door Module (DDM)
^ Electronic Brake Control Module (EBCM)
^ Head Up Display (HUD) W/UV6
^ HVAC Control Module W/C67
^ Inflatable Restraint Sensing and Diagnostic Module (SDM)
^ Instrument Panel Cluster (IPC)
^ Instrument Panel Integration Module (IPM) W/CJ2
^ Memory Seat Module (MSM) W/A45
^ Powertrain Control Module (PCM)
^ Radio
^ Rear Integration Module (RIM)
^ Remote Control Door Lock Receiver (RCDLR)
^ Remote Playback Device - CD Changer W/U1S
^ Theft Deterrent Control Module
^ Vehicle Communication Interface Module (VCIM) Generation-F1
^ Vehicle Interface Unit (VIU) Generation-2.6

The following modules have only one communication line connection to the Class 2 data circuit:
^ Driver Door Module (DDM).
^ Head Up Display (HUD) W/UV6
^ Memory Seat Module (MSM) W/A45
^ Vehicle Communication Interface Module (VCIM) Generation-F1
^ Vehicle Interface Unit (VIU) Generation-2.6

POWER DOOR SERIAL DATA LINE
The power door serial data line doe's 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 is used for serial data communication between the door modules as well as the driver door window switch assembly (DDSA).

Refer to Diagnostic System Check - Door Systems in Doors.

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application". RPO Codes