Data Link References

WARNING: This page is about a different car, the 2005 GMC Sierra and 2005 Chevrolet Silverado. 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. 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 Link Connector (DLC) Schematics
Audio Amplifier (AMP), w/UQ7 and Y91	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Body Control Module (BCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Communication Interface Module (OnStar®), w/UE1	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Digital Radio Receiver (DRR), w/U2K	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Driver Door Module (DDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Electro-Hydraulic Power Steering (EHPS) Module, w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Brake Control Module (EBCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Energy Storage Control Module (ESCM), w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Engine Control Module (ECM), w/LLY	CAN Class 2	Scan Tool Does Not Communicate with Class 2 Device
Generator Battery Control Module (GBCM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
HVAC Control Module	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Hybrid Control Module (HCM), w/HP2	High Speed GMLAN Class 2	Scan Tool Does Not Communicate with Class 2 Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Instrument Panel Cluster (IPC)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Memory Seat Module (MSM), w/AN3	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Passenger Door Module (PDM)	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Powertrain Control Module (PCM)	High Speed GMLAN, w/HP2 Class 2	Scan Tool Does Not Communicate with Class 2 Device
Radio	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Seat Audio (RSA) Controller, w/UK6	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Seat Entertainment (RSE), w/U42	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Rear Wheel Steering Control Module (RWSCM), w/NYS	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Remote Playback Device - CD Player (CDX), w/U1S	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Starter/Generator Control Module (SGCM), w/HP2	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Transfer Case Shift Control Module (TCSCM), w/NP1, NP8	Class 2	Scan Tool Does Not Communicate with Class 2 Device
Transmission Control Module (TCM), w/M74	CAN Class 2	Scan Tool Does Not Communicate with Class 2 Device