Low Speed GMLAN Serial Data Line

The low speed GMLAN serial data communication circuit on this vehicle is in a star configuration. The star has 3 splice packs, located as follows:

• The splice pack SP201 is located under the left side of the instrument panel (I/P), near the data link connector (DLC).
• The splice pack SP300 is located next by the left B-pillar.
• The splice pack SP303 is located next by the right B-pillar.

The following modules communicate on the low speed GMLAN serial data circuit:

• The splice pack SP201 attaches to:
  • The instrument panel module (IPM)
  • The head-up display (HUD), with UV6
  • The HVAC control module
  • The instrument panel cluster (IPC)
  • The radio
  • The steering column lock control module (SCLCM), with UA2
• The splice pack SP300 attaches to:
  • The audio amplifier
  • The driver door module (DDM)
  • The driver door switch (DDS) is attached to DDM
  • The driver position module (DPM), with A45
  • The digital radio receiver (DRR), with U2K
  • The inflatable restraint sensing and diagnostic module (SDM)
  • The left rear door module (LRDM)
  • The rear integration module (RIM)
  • The remote control lock door receiver (RCDLR)
  • The television (TV) module, with YK6/YK7
• The splice pack SP303 attaches to:
  • The communication interface module (OnStar), with UE1
  • The inflatable restraint SDM
  • The passenger door module (PDM)
  • The right rear door module (RRDM)

Refer to Data Communication Schematics  for more information.