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Data Link References

WARNING: This page is about a different car, the 2021 GMC Terrain and 2021 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

This table identifies which serial data link that a particular device uses for in-vehicle data transmission. Some devices may use more than one data link to communicate. Some devices 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 devices listed will be applicable to all vehicles. Refer to the schematics to determine which devices apply. For the description and operation of these serial data communication circuits, refer to Data Link Communications Description and Operation .

Reference Information 

Schematic Reference: Data Communication Wiring Schematics

Code Device Data Link Type Diagnostic Procedure
A11 Radio
  • Gateway Isolated High Speed GMLAN
  • Gateway Isolated Low Speed GMLAN
  • Ethernet Bus
A26 HVAC Controls
  • Low Speed GMLAN
  • Local Interconnect Network (LIN)
A97 Transmission Range Selector Controls Powertrain High Speed GMLAN DTC U0074
B10B Ambient Light/Sunload Sensor Local Interconnect Network (LIN) DTC U1500-U15FF
B110 Battery Sensor Module Local Interconnect Network (LIN) DTC U1500-U15FF
B174W Frontview Camera - Windshield
  • High Speed GMLAN
  • Low Speed GMLAN
B177 Rain/Ambient Light Sensor Module Local Interconnect Network (LIN) DTC U1500-U15FF
B218L Side Object Sensor Module - Left Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
E13LA Headlamp Assembly - Left Local Interconnect Network (LIN) DTC U1500-U15FF
E13RA Headlamp Assembly - Right Local Interconnect Network (LIN) DTC U1500-U15FF
G10 Cooling Fan Motor Local Interconnect Network (LIN) DTC U1500-U15FF
K9 Body Control Module
  • High Speed GMLAN
  • Low Speed GMLAN
  • Local Interconnect Network (LIN)
K17 Electronic Brake Control Module
  • High Speed GMLAN
  • Chassis High Speed GMLAN
K20 Engine Control Module
  • High Speed GMLAN
  • Powertrain High Speed GMLAN
  • Local Interconnect Network (LIN)
K26 Headlamp Control Module
  • Gateway Expansion High Speed GMLAN
  • Local Interconnect Network (LIN)
K29F Seat Heating Control Module - Front Local Interconnect Network (LIN) DTC U1500-U15FF
K29R Seat Heating Control Module - Rear Local Interconnect Network (LIN) DTC U1500-U15FF
K33 HVAC Control Module
  • Low Speed GMLAN
  • Local Interconnect Network (LIN)
K36 Inflatable Restraint Sensing and Diagnostic Module
  • Chassis High Speed GMLAN
  • Low Speed GMLAN
K39 Liftgate Control Module
  • Low Speed GMLAN
  • Local Interconnect Network (LIN)
K40D Seat Memory Control Module - Driver
  • Low Speed GMLAN
  • Local Interconnect Network (LIN)
K43 Power Steering Control Module
  • High Speed GMLAN
  • Chassis High Speed GMLAN
K47 Rear Differential Clutch Control Module
  • High Speed GMLAN
  • Chassis High Speed GMLAN
K56 Serial Data Gateway Module
  • Gateway Expansion High Speed GMLAN
  • Gateway Isolated High Speed GMLAN
  • High Speed GMLAN
  • Gateway Isolated Low Speed GMLAN
  • Low Speed GMLAN
  • Chassis High Speed GMLAN
K61 Sunroof Control Module Local Interconnect Network (LIN) DTC U1500-U15FF
K71 / Q8 / T12 Transmission Control Module / Control Solenoid Valve Assembly / Automatic Transmission Assembly
  • High Speed GMLAN
  • Local Interconnect Network (LIN)
K73 Telematics Communication Interface Control Module
  • Gateway Isolated High Speed GMLAN
  • Gateway Isolated Low Speed GMLAN
  • Ethernet Bus
K84 Keyless Entry Control Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
K85 Passenger Presence Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
K108 Active Noise Cancellation Module Gateway Isolated Low Speed GMLAN DTC U007D
K111 Fuel Pump Driver Control Module Powertrain High Speed GMLAN DTC U0074
K157 Video Processing Control Module Gateway Isolated Low Speed GMLAN DTC U007D
K171 Hands-Free Liftgate Sensor Control Module Local Interconnect Network (LIN) DTC U1500-U15FF
K173 Transmission Range Control Module
  • High Speed GMLAN
  • Powertrain High Speed GMLAN
  • Local Interconnect Network (LIN)
K182 Parking Assist Control Module
  • Chassis High Speed GMLAN
  • Low Speed GMLAN
M35D Window Motor Module - Driver Local Interconnect Network (LIN) DTC U1500-U15FF
M96A Active Grille Air Shutter 1 Actuator Local Interconnect Network (LIN) DTC U1500-U15FF
P2 Transmission Shift Lever Position Indicator Local Interconnect Network (LIN) DTC U1500-U15FF
P16 Instrument Cluster
  • Gateway Isolated Low Speed GMLAN
  • Ethernet Bus
  • Local Interconnect Network (LIN)
P17 Info Display Module Gateway Isolated Low Speed GMLAN DTC U007D
S32D Seat Heating Switch - Driver Local Interconnect Network (LIN) DTC U1500-U15FF
S32LR Seat Heating Switch - Left Rear Local Interconnect Network (LIN) DTC U1500-U15FF
S32P Seat Heating Switch - Passenger Local Interconnect Network (LIN) DTC U1500-U15FF
S32RR Seat Heating Switch - Right Rear Local Interconnect Network (LIN) DTC U1500-U15FF
S70R Steering Wheel Controls Switch - Right Local Interconnect Network (LIN) DTC U1500-U15FF
S79D Window Switch - Driver Local Interconnect Network (LIN) DTC U1500-U15FF
S79LR Window Switch - Left Rear Local Interconnect Network (LIN) DTC U1500-U15FF
S79P Window Switch - Passenger Local Interconnect Network (LIN) DTC U1500-U15FF
S79RR Window Switch - Right Rear Local Interconnect Network (LIN) DTC U1500-U15FF
T3 Audio Amplifier
  • Gateway Isolated Low Speed GMLAN
  • Ethernet Bus
T19 Power Supply Transformer Powertrain High Speed GMLAN DTC U0074
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