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 | ||||||||
Body Control Module (BCM) |
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Communication Interface Module (OnStar), w/UE1 |
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Chime Module w/UL5 | Low Speed GMLAN | |||||||
Digital Radio Receiver (DRR), w/U2K | Low Speed GMLAN | |||||||
Driver Door Switch (DDS) |
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Electronic Brake Control Module (EBCM) | High Speed GMLAN | |||||||
Electronic Suspension Control Module (ESCM), F45, F55 | High Speed GMLAN | |||||||
Engine/Powertrain Control Module (ECM/PCM) | High Speed GMLAN | |||||||
Front and Rear Object Alarm Module | Low Speed GMLAN | |||||||
Fuel Pump Control Module (FPCM) | High Speed GMLAN | |||||||
Glow Plug Control Module (GPCM) | High Speed GMLAN | |||||||
HVAC Control Module | Low Speed GMLAN | |||||||
Inside Rearview Mirror | Low Speed GMLAN | |||||||
Instrument Panel Cluster (IPC) | Low Speed GMLAN | |||||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | |||||||
Inflatable Restraint Roll Over Sensor (ROS) w/ASF | Low Speed GMLAN | |||||||
Memory Seat Module (MSM)/Driver Position Module (DPM) | Low Speed GMLAN | |||||||
Passenger Door Switch (PDS) |
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Passenger Presence System (PPS) | Low Speed GMLAN | |||||||
Power Take Off Module (PTO) | High Speed GMLAN | |||||||
Radio | Low Speed GMLAN | |||||||
Rear Seat Audio (RSA) w/UK6 | Low Speed GMLAN | |||||||
Remote Control Door Lock Receiver (RCDLR) w/AP3, AP8 | Low Speed GMLAN | |||||||
Theft Deterrent Module (TDM) | Low Speed GMLAN | |||||||
Trailer Brake Control Module (TBCM) | High Speed GMLAN | |||||||
Transfer Case Control Module (TCCM) w/NP8, NR3, NQH, NQF, NGQ | High Speed GMLAN | |||||||
Transmission Control Module (TCM) | High Speed GMLAN | |||||||
Ultrasonic Parking Aid (UPA) Module w/UD7 | Low Speed GMLAN |