Data Link Connector (DLC)
The 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. |
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 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 |
| • | Vehicle interface unit (VIU) w/UE1 |
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
Diagnostic System Check - Door Systems
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 |
| • | Vehicle Interface Unit (VIU) w/EU1 |
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
Diagnostic System Check - Remote Keyless Entry
in keyless entry.
