Data Link References

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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
Accessory DC Power Control Module Assembly (APM), w/HP2	High Speed Hybrid GMLAN	DTC U0074
Air Conditioning Control Module (ACCM) (Part of AC Compressor), w/HP2	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Audio Amplifier w/UQA/UQS	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Assist Step Control Module, (Articulating Running Boards (ARB)) w/BRS	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Auxiliary Body Control Module (XBCM) w/JL1, JL4	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Battery Energy Control Module (BECM) w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Body Control Module (BCM)	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Chime Module w/UL5	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Digital Radio Receiver (DRR), w/U2K	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Drive Motor Generator Power Inverter Module (PIM) Assembly (Includes Drive Motor Control Module (MCM) 1, 2 and Hybrid Powertrain Control Module (HPCM) ) w/HP2	High Speed Hybrid GMLAN High Speed GMLAN	DTC U0074 Scan Tool Does Not Communicate with High Speed GMLAN Device
Driver Door Switch (DDS) w/YE9	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Electronic Brake Control Module (EBCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Suspension Control Module (ESCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Engine/Powertrain Control Module (ECM/PCM)	High Speed GMLAN High Speed Hybrid GMLAN w/HP2	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 w/HP2
Fuel Pump Control Module (FPCM) w/LFA, LC9, LMG, LY2, LY5, L76, L92	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inertial Sensor w/HP2	High Speed Hybrid GMLAN	DTC U0074
Inside Rearview Mirror (ISRVM) w/TQ5	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Instrument Panel Cluster (IPC)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Passenger Presence System (PPS) Module w/AL0	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Roll Over Sensor (ROS) w/ASF	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Liftgate Module (LGM) w/E61	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Memory Seat Module (MSM)/Driver Position Module (DPM) w/AN3	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Door Switch (PDS) w/YE9	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Power Steering Control Module (PSCM) w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Radio	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Rear Heated/Vented Seat Control Module (RHVSM) w/KA6	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Rear Seat Audio (RSA) w/UK6	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Remote Control Door Lock Receiver (RCDLR) w/AP3, AP8	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Serial Data Gateway Module (SDGM) w/HP2	High Speed Hybrid GMLAN High Speed GMLAN Low Speed GMLAN	DTC U0074 Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
Theft Deterrent Module (TDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Transfer Case Control Module (TCCM) w/NP8, NR3, NQH, NQF, NGQ	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Transmission Control Module (TCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Ultrasonic Parking Aid (UPA) Module w/UD7	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Vehicle Communication Interface Module (VCIM) (OnStar®), w/UE1	High Speed GMLAN - pass through only Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device