The following modules communicate on the class 2 serial data circuit:

- The audio amplifier (AMP), w/UQ7 and Y91

- The body control module (BCM)

- The communication interface module (OnStar®), w/UE1

- The digital radio receiver (DRR), w/U2K

- The driver door module (DDM)

- The electronic brake control module (EBCM)

- The generator battery control module (GBCM)

- The HVAC control module

- The hybrid control module (HCM), w/HP2

- The inflatable restraint sensing and diagnostic module (SDM)

- The instrument panel cluster (IPC)

- The memory seat module (MSM), w/AN3

- The passenger door module (PDM)

- The powertrain/engine control module (PCM/ECM)

- The radio

- The rear seat audio (RSA) controller, w/UK6

- The rear seat entertainment (RSE) assembly w/U42

- The rear wheel steering control module (RWSCM), w/NYS

- The remote playback device - CD player (CDX), w/U1S

- The transfer case shift control module (TCSCM), w/NP1/NP8

- The transmission control module (TCM), w/M74