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. 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
K1 14V Power Module	Powertrain High Speed GMLAN	DTC U0074
G1 A/C Compressor Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
T18 Battery Charger Control Module	High Speed GMLAN High Voltage Energy Management High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007A
K16 Battery Energy Control Module (BECM)	High Speed GMLAN High Voltage Energy Management High Speed GMLAN * BECM Dedicated Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007A DTC U2401
K9 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
K10 Coolant Heater Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K107A Drive Motor 1 Control Module	High Speed GMLAN Chassis High Speed GMLAN Powertrain High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0074
K107B Drive Motor 2 Control Module	High Speed GMLAN Chassis High Speed GMLAN Powertrain High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0074
S79D Driver Window Switch	Local Interconnect Network (LIN)	DTC U1500-U15BF
M74D Driver Window Motor	Local Interconnect Network (LIN)	DTC U1500-U15BF
K17 Electronic Brake Control Module (EBCM)	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
K20 Engine Control Module (ECM)	High Speed GMLAN Powertrain High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074
K27 Fuel Pump Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K33 HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K112A Hybrid Battery Interface Control Module 1	BECM Dedicated Bus	DTC U2401
K112B Hybrid Battery Interface Control Module 2	BECM Dedicated Bus	DTC U2401
K112C Hybrid Battery Interface Control Module 3	BECM Dedicated Bus	DTC U2401
K112D Hybrid Battery Interface Control Module 4	BECM Dedicated Bus	DTC U2401
K114A Hybrid Powertrain Control Module 1	High Speed GMLAN Chassis High Speed GMLAN Powertrain High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0074
K114B Hybrid Powertrain Control Module 2	Low Speed GMLAN High Speed GMLAN Powertrain High Speed GMLAN High Voltage Energy Management High Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 DTC U007A
K36 Inflatable Restraint Sensing and Diagnostic Module (SDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
P16 Instrument Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K84 Keyless Entry Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
S79LR Left Rear Window Switch	Local Interconnect Network (LIN)	DTC U1500-U15BF
B119 Multi-axis Acceleration Sensor Module	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K41 Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K83 Parking Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K65 Passenger Presence Detection Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
S79P Passenger Window Switch	Local Interconnect Network (LIN)	DTC U1500-U15BF
T6 Power Inverter Module	High Speed GMLAN Chassis High Speed GMLAN Powertrain High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0074
K43 Power Steering Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
A11 Radio	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
S79RR Right Rear Window Switch	Local Interconnect Network (LIN)	DTC U1500-U15BF
K29 Seat Heating Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B99 Steering Wheel Angle Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K71 Transmission Control Module (TCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K73 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
M75 Windshield Wiper Motor	Local Interconnect Network (LIN)	DTC U1500-U15BF