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 |
| • | Keyless entry program enable signal at terminal 8 |
| • | Serial Data E&C at terminal 14 |
Class 2 Serial Data Line
The data line 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:
| • | Body control module (BCM) |
| • | Driver door module (DDM) |
| • | Electronic brake control module (EBCM) |
| • | Inflatable restraint sensing and diagnostic module (SDM) |
| • | Instrument panel cluster (IPC) |
| • | Instrument panel integration module (IPM) |
| • | Memory seat module (MSM), w/A45 |
| • | Powertrain control module (PCM) |
| • | Remote control door lock receiver (RCDLR) |
| • | Theft deterrent control module |
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.
The following modules communicate on power door serial data line:
| • | Driver door switch assembly (DDSA) |
| • | Front passenger door module (FPDM) |
In order to diagnose the door lock serial data line, refer to
DTC U1161-U1163 or U1170
in Doors.
Entertainment and Comfort Serial Data Line
The entertainment and comfort serial data line does not communicate with the
scan tool via the DLC. Entertainment and comfort serial data line is used by the following
modules to exchange information between the system components.
| • | Instrument panel integration module (IPM) |
| • | Remote playback device - CD changer (CDX) |
| • | Vehicle interface unit (VIU) |
In order to diagnose the entertainment and comfort serial data line, refer to
Remote Playback Device Inoperative
in Entertainment.
Keyless Entry Program Enable Line
The keyless entry program enable line allows the scan tool to command the remote
control door lock receiver (RCDLR) into the program key fob mode. For diagnosis of
this circuit, refer to
Symptoms - Keyless Entry
in
Keyless Entry.
