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 Operation .

Control Module

Data Link Type

Diagnostic Procedure

Schematic Reference: Data Link Connector Schematics

Air Suspension Control Module (ASCM) w/F38

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Amplifier

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Auxiliary HVAC Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Body Control Module (BCM)

    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Communication Interface Module (OnStar), w/UE1

    • High Speed GMLAN - pass through only
    • 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

Distance Sensing Cruise Control (DSCC) Module w/K59

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Driver Door Module (DDM)/Driver Door Switch Assembly (DDSA)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Local Interconnect Network (LIN)

DTC U1500, U1511, U1512, or U1513

Electronic Brake Control Module (EBCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Electronic Suspension Control (ESC) Module w/FE1, F55

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Engine/Powertrain Control Module (ECM/PCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Front and Rear Object Alarm Module w/UFR

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Front Passenger Door Module (FPDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Local Interconnect Network (LIN)

DTC U1500, U1511, U1512, or U1513

HVAC Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inside Rearview Mirror

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 Sensing and Diagnostic Module (SDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Memory Seat Module (MSM)/Driver Position Module (DPM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Passenger Presence System (PPS)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Radio

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Rear Heated Seat Control 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

Transmission Control Module (TCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Vehicle Theft Deterrent (VTD) Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Window Motors (all)

Local Interconnect Network (LIN)

DTC U1500, U1511, U1512, or U1513