Class 2 Serial Data Line

The class 2 serial data line on this vehicle is a ring/star configuration. The BCM and PCM form the ring portion of the class 2 serial data circuit. If one of the class 2 serial data circuits to the BCM or PCM opens, communication will not be interrupted. The following modules communicate on the class 2 serial data line:

• The body control module (BCM)
• The driver door module (DDM)
• The electronic brake control module (EBCM)
• 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 liftgate control module (LGM)
• The memory seat module-driver w/power seat
• The memory seat module-passenger w/power seat
• The powertrain control module (PCM)
• The radio
• The radio amplifier
• The RSA/HVAC control module-rear auxiliary
• The theft deterrent control module w/Immobilizer
• 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.
• SP206 - 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 .