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 | ||||||
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Schematic Reference: Data Communication Schematics | ||||||||
Accessory Power Module (APM), w/ HP2 | Powertrain expansion bus | |||||||
Air Conditioning Control Module (ACCM), w/ HP2 | Low Speed GMLAN | |||||||
Audio Amplifier | Low Speed GMLAN | |||||||
Assist Step Control Module (ARB) | Low Speed GMLAN | |||||||
Battery Energy Control Module (BECM) w/ HP2 | High Speed GMLAN | |||||||
Body Control Module (BCM) |
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Chime Module w/ UL5 | Low Speed GMLAN | |||||||
Digital Radio Receiver (DRR) | Low Speed GMLAN | |||||||
Power Inverter Module (PIM) w/ HP2 |
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Driver Door Switch (DDS) |
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Driver Position (Memory Seat) Module | Low Speed GMLAN | |||||||
Electronic Brake Control Module (EBCM) | High Speed GMLAN | |||||||
Electronic Suspension Control (ESC) Module | High Speed GMLAN | |||||||
Engine / Powertrain Control Module (ECM/PCM) |
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Fuel System Control Module (FSCM) | High Speed GMLAN | |||||||
Glow Plug Control Module | High Speed GMLAN | |||||||
HVAC Control Module | Low Speed GMLAN | |||||||
Inertia Sensor w/ HP2 | High Speed Hybrid GMLAN | |||||||
Inside Rearview Mirror (ISRVM) | Low Speed GMLAN | |||||||
Instrument Panel Cluster (IPC) | Low Speed GMLAN | |||||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | |||||||
Liftgate Module (LGM) | Low Speed GMLAN | |||||||
Passenger Door Switch (PDS) |
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Passenger Presence System (PPS) Module | Low Speed GMLAN | |||||||
Power Steering Control Module (PSCM) w/ HP2 | High Speed GMLAN | |||||||
Power Take Off (PTO) Module | High Speed GMLAN | |||||||
Radio | Low Speed GMLAN | |||||||
Rear Heated / Vented Seat Control Module (RHVSM) | Low Speed GMLAN | |||||||
Rear Seat Audio (RSA) Module | Low Speed GMLAN | |||||||
Remote Control Door Lock Receiver (RCDLR) | Low Speed GMLAN | |||||||
Roll Over Sensor (ROS) | Low Speed GMLAN | |||||||
Serial Data Gateway Module (SDGM) w/ HP2 |
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Theft Deterrent Module (TDM) | Low Speed GMLAN | |||||||
Trailer Brake Control Module (TBCM) | High Speed GMLAN | |||||||
Transfer Case Control Module (TCCM) | High Speed GMLAN | |||||||
Transmission Control Module (TCM) | High Speed GMLAN | |||||||
Ultrasonic Park Assist (UPA) Module | Low Speed GMLAN | |||||||
Vehicle Communication Interface Module (OnStar® VCIM) |
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