This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .
Control Module | Data Link Type | Diagnostic Procedure | ||||
|---|---|---|---|---|---|---|
Schematic Reference: Data Communication Schematics | ||||||
Audible Alert Control Module (CHIME) (w/UL5) | Low Speed GMLAN | |||||
Auxiliary Heater Control Module (FOH) (w/K08, Coolant Heater) | High Speed GMLAN | |||||
Body Control Module (BCM) |
| |||||
Electronic Brake Control Module (EBCM) (W/JL4, JL9, LU3) | High Speed GMLAN | |||||
Engine Control Module (ECM) | High Speed GMLAN | |||||
Fuel System Control Module (FSCM) (W/LMF) | High Speed GMLAN | |||||
Glow Plug Control Module (GPCM) (W/LMM) | High Speed GMLAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | |||||
Instrument Panel Cluster (IPC) | Low Speed GMLAN | |||||
Passenger Presence System (PPS) (w/o YF7) | Low Speed GMLAN | |||||
Radio w/o UL5 | Low Speed GMLAN | |||||
Remote Compass Module (RCM) | Local Interconnect Network (LIN) | |||||
Remote Control Door Lock Receiver (RCDLR) W/AUO | Low Speed GMLAN | |||||
Roll Over Sensor (ROS) (w/o YF7) | Low Speed GMLAN | |||||
Transmission Control Module (TCM) | High Speed GMLAN | |||||
Vehicle Theft Deterrent (VTD) Control Module | Low Speed GMLAN | |||||
