Data Link Connector (DLC)
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 agreements.
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 supply
a power ground at Pin 4 and a clean signal ground at Pin 5.
The Class 2 serial data circuit is provided at Pin 2
of the DLC.
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:
| • | Powertrain Control Module (PCM) |
| • | Electronic Brake Control Module (EBCM) |
| • | Remote Function Actuator (RFA) |
| • | Rear Integration Module (RIM) |
| • | Compact Disc Player (CDX) with U1S |
| • | Inflatable Restraint Sensing and Diagnostic Module (SDM) |
| • | Dash Integration Module (DIM) |
| • | Instrument Panel Integration Module (IPM) with CJ2 |
| • | Memory Seat Module (MSM) with A45 |
| • | Heads Up Display (HUD) with UV6 |
| • | Climate Control Panel/Heater AC Control (CCP) with C67 |
| • | Instrument Cluster (IPC) |
| • | Pass-Key® III Vehicle Theft Deterrent Module (VTD) |
The following modules have only one communication line connection to
the Class 2 data circuit:
| • | Memory Seat Module (MSM) |
| • | Driver Door Module (DDM) |
Simple Bus Interface (SBI) Serial Data Line
SBI does not communicate with the scan tool via the DLC. SBI information
is interpreted by the driver door module (DDM) and transmitted on the Class 2
data link by the DDM.
The simple bus interface (SBI) is used for serial data communication
between the four door modules as well as the driver door switch (DDS).
Refer to
Diagnostic System Check - Door Systems
in Doors.
