This table identifies which serial data link that a particular module uses for in-vehicle data transmission and communication with the scan tool. Some modules may use more than one data link to communicate. Some modules may use different circuits for functional and diagnostic communication. Use the schematic reference link in the table for additional information. 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 | ||||
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Schematic Reference: Data Communication Schematics | ||||||
Body Control Module (BCM) |
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Communication Interface Module (OnStar) | Class 2 | |||||
Digital Radio Receiver | Low Speed GMLAN | |||||
Electronic Brake Control Module (EBCM) |
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Engine Control Module (ECM), with L61 |
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Inflatable Restraint Sensing and Diagnostic Module (SDM) | Class 2 | |||||
Instrument Panel Cluster (IPC) | Class 2 | |||||
Power Steering Control Module (PSCM) | Class 2 | |||||
Powertrain Control Module (PCM), with L66 |
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Radio | Low Speed GMLAN | |||||
Transmission Control Module (TCM), with L61 |
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