Class 2 Serial Data Line

The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:

• The body control module (BCM)
• The digital radio receiver
• The driver door module (DDM)
• The electronic brake control module (EBCM)
• The front passenger door module (FPDM)
• The HVAC control module
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The memory seat module (MSM)
• The powertrain control module (PCM)
• The radio
• The radio amplifier
• The rear seat audio (RSA) controller
• The rear seat entertainment (RSE) assembly w/U42
• The rear wheel steering control module
• The remote playback device-CD player w/U1S
• The transfer case shift control module
• The transmission control module (TCM) w/Allison Transmission
• The theft deterrent control module
• 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 splice packs and a data link connector (DLC):

• SP205
• SP206
• SP207
• DLC-connects the scan tool to the class 2 serial data circuits.

Refer to Data Link Communications Component Views   for an illustrated view of the splice pack locations.