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) |
| • | Inflatable Restraint Sensing and Diagnostic Module (SDM) |
| • | Memory Seat Module (MSM) with A43 |
| • | Heater and AC Programmer Module (HCM) |
| • | Instrument Cluster (IPC) |
| • | Pass-Key® III Vehicle Theft Deterrent Module (VTD) |
| • | Driver Door Module (DDM) |
| • | Body Control Module (SBM) |
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 door modules as well as the driver door switch (DDS).
Refer to Diagnostic System Check - Door Systems in Doors.
Entertainment and Climate Control (E&C) Serial Data Line
E&C serial data line is used by the radio and the climate control systems to exchange information between the system components.
Refer to Diagnostic System Check in HVAC Systems -- Automatic.
