Class 2 Serial Data Line

The class 2 serial data line on this vehicle is a star configuration. The PCM has an additional class 2 serial data circuit to body control module (BCM) or to theft deterrent control module, if equipped. If one of the class 2 serial data circuits to the PCM opens, communication will not be interrupted. The following modules communicate on the class 2 serial data line:

• The audio amplifier (early production), refer to Radio/Audio System Description and Operation in Entertainment for more information.
• The BCM
• The digital radio receiver (DRR)
• The driver door module (DDM)
• The driver seat module (DSM)
• The DVD player
• The electronic brake control module (EBCM)
• The end gate module (EGM)
• The front passenger door control module (FPDM)
• The HVAC control module
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The lift gate control module (LGM)
• The PCM
• The power roof module
• The radio
• The HVAC control module auxiliary
• The theft deterrent control module, for export
• The transfer case shift control module, w/4WD
• The vehicle communication interface module (VCIM), w/UE1

The class 2 serial data line allows a scan tool to communicate with these modules for testing purposes, checking for DTCs, and to activate/enable/disable functions. These class 2 serial data circuits are bussed together via two splice packs and a data link connector (DLC):

• SP205 - Located behind the I/P near the headlamp switch connector.
• SP306 - Located in the body harness near the rear of the right rear seat under the carpet.
• DLC - Connects the scan tool to the class 2 serial data circuits.

Refer to Data Link Communications Component Views .