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. This table is used to assist in correcting a communication malfunction between the control module and the scan tool. 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) | Class 2 | |||||
Auxiliary Heater Control Module (FOH) (w/K08, Coolant Heater) | High Speed GMLAN | |||||
Body Control Module (BCM) | Class 2 | |||||
Electronic Brake Control Module (EBCM) | Class 2 | |||||
Engine Control Module (ECM) (Diesel) |
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Glow Plug Control Module (GPCM) (Diesel) | High Speed GMLAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Class 2 | |||||
Instrument Panel Cluster (IPC) | Class 2 | |||||
Powertrain Control Module (PCM) (Gas) | Class 2 | |||||
Radio (w/o UL5) | Class 2 | |||||
Remote Control Door Lock Receiver (RCDLR) w/AUO | Class 2 | |||||
Transmission Control Module (TCM) (Diesel) | High Speed GMLAN |