GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2004 🢒 XLR 🢒 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. 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. The BCM emulates some devices that are on high speed GMLAN serial data circuit to the modules on class 2 serial data circuit. The BCM transmits multiple Node Alive messages using source IDs that correspond to each of those high speed GMLAN nodes. This is in addition to the BCM behaving itself as a real node. 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

Audio Amplifier

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Body Control Module (BCM)
    • High Speed GMLAN
    • Class 2

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

CD Player (CDX)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Digital Radio Receiver (DRR)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Distance Sensing Cruise Control (DSCC) Module

High Speed GMLAN

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

Driver Door Module (DDM)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Driver Door Switch (DDS)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Driver Position Module

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Electronic Brake Control Module (EBCM)

High Speed GMLAN

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

Electronic Suspension Control (ESC) Module

High Speed GMLAN

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

Engine Control Module (ECM)

High Speed GMLAN

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

Folding Top Controller (FTC)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Instrument Panel Cluster (IPC)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Inflatable Restraint Sensing and Diagnostic Module (SDM)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Head Up Display (HUD)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

HVAC Control Module

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Passenger Door Module (PDM)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Radio

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Remote Control Door Lock Receiver (RCDLR)

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Steering Column Lock Control Module (SCLCM), for Europe

Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device

Transmission Control Module (TCM)

High Speed GMLAN

Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device

Vehicle Communication Interface Module (VCIM)
    • High Speed GMLAN - pass through only
    • Class 2

Refer to Scan Tool Does Not Communicate with Class 2 Device