GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Express - AWD 🢒 Engine 🢒 Engine Electrical 🢒 Data Link References

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 Communication Schematics

Audible Alert Control Module (CHIME) (w/UL5)

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Auxiliary Heater Control Module (FOH) (w/K08, Coolant Heater)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Body Control Module (BCM)

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Electronic Brake Control Module (EBCM)

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Engine Control Module (ECM) (Diesel)
    • High Speed GMLAN
    • Class 2

Scan Tool Does Not Communicate with Class 2 Device

Scan Tool Does Not Communicate with High Speed GMLAN Device

Glow Plug Control Module (GPCM) (Diesel)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN 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

Powertrain Control Module (PCM) (Gas)

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Radio (w/o UL5)

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Remote Control Door Lock Receiver (RCDLR) w/AUO

Class 2

Scan Tool Does Not Communicate with Class 2 Device

Transmission Control Module (TCM) (Diesel)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device