GM Service Manual Online
For 1990-2009 cars only

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 OperationData Link Communications Description and Operation.

Control Module

Data Link Type

Diagnostic Procedure

Schematic Reference: Data Communication Schematics.

Automatic Headlamp Levelling Control Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Bluetooth Module

Non-GMLAN

--

Body Control Module (BCM)

    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High 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

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Engine Control Module (ECM)

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

Inflatable Restraint Sensing and Diagnostic Module (SDM)

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

Memory Mirror Module

Non-GMLAN

--

Memory Seat Module (MSM)

Non-GMLAN

--

Navigation Unit

Non-GMLAN

--

Navigation Interface Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Object Alarm Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Rear Seat Entertainment Interface Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Remote Function Actuator (RFA)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Secondary Information Centre

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Seat Interface Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Steering Angle Sensor

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Theft Deterrent Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Transmission Control Module (TCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Telematics Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device