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Data Link References

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. Not all modules listed will be applicable to all vehicles. Refer to the schematics to determine which modules apply. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .

Control module Data Link Type Diagnosis Procedure
Schematic Reference: Data Communication Schematics
Body Control Module
• High Speed GMLAN

• Low Speed GMLAN

• Local Interconnect Network (LIN)



• Scan Tool Does Not Communicate with High Speed GMLAN Device

• Scan Tool Does Not Communicate with Low Speed GMLAN Device

• DTC U1500-U15BF


Digital Radio Receiver Control Module Mid Speed GMLAN Scan Tool Does Not Communicate with Mid Speed GMLAN Device
Electronic Brake Control Module
• High Speed GMLAN

• Chassis High Speed GMLAN



• Scan Tool Does Not Communicate with High Speed GMLAN Device

• Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device


Engine Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device
Fuel Pump Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device
Headlamp Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device
Headlamp - Left Local Interconnect Network (LIN) DTC U1500-U15BF
Headlamp - Right Local Interconnect Network (LIN) DTC U1500-U15BF
HVAC Control Module
• Low Speed GMLAN

• Local Interconnect Network (LIN)



• Scan Tool Does Not Communicate with Low Speed GMLAN Device

• DTC U1500-U15BF


Inflatable Restraint Sensing and Diagnostic Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Info Display Module Local Interconnect Network (LIN) DTC U1500-U15BF
Instrument Panel Cluster Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Keyless Entry Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Liftgate Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Mirror Control Module - Left Local Interconnect Network (LIN) DTC U1500-U15BF
Mobile Telephone Control Module Mid Speed GMLAN Scan Tool Does Not Communicate with Mid Speed GMLAN Device
Multi-axis Acceleration Sensor Chassis High Speed GMLAN Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Multimedia Player Interface Module
• Mid Speed GMLAN

• Low Speed GMLAN



• Scan Tool Does Not Communicate with Mid Speed GMLAN Device

• Scan Tool Does Not Communicate with Low Speed GMLAN Device


Parking Assist Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Parking Brake Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device
Passenger presence module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio
• Mid Speed GMLAN

• Low Speed GMLAN



• Scan Tool Does Not Communicate with Mid Speed GMLAN Device

• Scan Tool Does Not Communicate with Low Speed GMLAN Device


Radio/HVAC Controls Local Interconnect Network (LIN) DTC U1500-U15BF
Rain Sensor Local Interconnect Network (LIN) DTC U1500-U15BF
Rear audio control module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Rear Differential Clutch Control Module
• High Speed GMLAN

• Chassis High Speed GMLAN



• Scan Tool Does Not Communicate with High Speed GMLAN Device

• Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device


Seat Heating Control Module - Rear
• Low Speed GMLAN

• Local Interconnect Network (LIN)



• Scan Tool Does Not Communicate with Low Speed GMLAN Device

• DTC U1500-U15BF


Seat memory control module
• Low Speed GMLAN

• Local Interconnect Network (LIN)



• Scan Tool Does Not Communicate with Low Speed GMLAN Device

• DTC U1500-U15BF


Security Siren Local Interconnect Network (LIN) DTC U1500-U15BF
Steering Angle Sensor Chassis High Speed GMLAN Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Steering Column Lock Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Sunroof control module Local Interconnect Network (LIN) DTC U1500-U15BF
Sunroof Sunshade Motor Module Local Interconnect Network (LIN) DTC U1500-U15BF
Suspension Control Module
• High Speed GMLAN

• Chassis High Speed GMLAN



• Scan Tool Does Not Communicate with High Speed GMLAN Device

• Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device


Telematics Communication Interface Control Module
• High Speed GMLAN

• Low Speed GMLAN



• Scan Tool Does Not Communicate with High Speed GMLAN Device

• Scan Tool Does Not Communicate with Low Speed GMLAN Device


Trailer Lighting Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device
Transmission Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device
Ultrasonic Intrusion Sensor Module Local Interconnect Network (LIN) DTC U1500-U15BF
Window Motor - Driver Local Interconnect Network (LIN) DTC U1500-U15BF
Window Motor - Passenger Local Interconnect Network (LIN) DTC U1500-U15BF
Window Switch - Driver Local Interconnect Network (LIN) DTC U1500-U15BF
Window Switch - Left Rear Local Interconnect Network (LIN) DTC U1500-U15BF
Window Switch - Passenger Local Interconnect Network (LIN) DTC U1500-U15BF
Window Switch - Right Rear Local Interconnect Network (LIN) DTC U1500-U15BF