Class 2 Serial Data Line

The class 2 serial data line on this vehicle is a combination ring-star configuration, where body control module (BCM) is connected to multiple modules. Refer to Data Link Connector (DLC) Schematics  for schematics. The following modules communicate on class 2 bus:

• The BCM
• The communication interface module (OnStar®), w/UE1
• The digital radio receiver (DRR), w/U2K
• The electronic brake control module (EBCM)
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The powertrain control module (PCM)
• The radio
• The transfer case shift control module (TCSCM), w/4WD