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Data Link References

WARNING: This page is about a different car, the 2022 Cadillac CT4. 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
  • CAN 5
  • Infotainment CAN
  • Ethernet 2
  • Ethernet 4
  • Ethernet 6
A22 Radio Control CAN 5 Scan Tool Does Not Communicate with Device on CAN 5 
A26 Heater and Air Conditioning User Interface Control - Front CAN 5 Scan Tool Does Not Communicate with Device on CAN 5 
A103 Roof Console Local Interconnect Network (LIN) DTC U1100-U12FF
B75 Mass Airflow Sensor Local Interconnect Network (LIN) DTC U0600-U06FF
B110 Battery Monitor Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
B117 Windshield Outside Moisture Sensor Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
B160 Inside Air Moisture and Windshield Temperature Sensor Local Interconnect Network (LIN) DTC U0600-U06FF
B165 Content Theft Deterrent Sensor Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
B174W Front View Camera - Windshield
  • CAN 2
  • CAN 8
B218L Side Obstacle Detection Control Module - Left CAN 4 Scan Tool Does Not Communicate with Device on CAN 4 
B218R Side Obstacle Detection Control Module - Right CAN 4 Scan Tool Does Not Communicate with Device on CAN 4 
B233B Forward Range Radar Sensor - Long Range CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233LF Short Range Radar Sensor - Left Front CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233LR Short Range Radar Rear Sensor - Left CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233R Short Range Radar Rear Sensor CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233RF Short Range Radar Sensor - Right Front CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233RR Short Range Radar Rear Sensor - Right CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233SL Short Range Radar Rear Side Sensor - Left CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
B233SR Short Range Radar Rear Side Sensor - Right CAN 8 Scan Tool Does Not Communicate with Device on CAN 8 
G10 Cooling Fan Motor Local Interconnect Network (LIN) DTC U0600-U06FF
G58 Evaporative Emission Canister Purge Pump Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
G59 Engine Coolant Pump Local Interconnect Network (LIN) DTC U0600-U06FF
K9 Body Control Module
  • CAN 2
  • Local Interconnect Network (LIN)
K19 Suspension Control Module CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K20 Engine Control Module
  • CAN 2
  • CAN 3
  • Powertrain CAN
  • Local Interconnect Network (LIN)
K29FV Front Seat Heater Vent Control Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K32 Heated Steering Wheel Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K36 Restraints Control Module CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K40D Driver Seat Adjuster Memory Module
  • CAN 4
  • Local Interconnect Network (LIN)
K40P Passenger Seat Adjuster Memory Module
  • CAN 4
  • Local Interconnect Network (LIN)
K43 Power Steering Control Module CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K56 Serial Data Gateway Module
  • CAN 1
  • CAN 2
  • CAN 3
  • CAN 4
  • CAN 5
  • CAN 8
  • Ethernet 2
  • Ethernet 3
  • Ethernet 7
  • Ethernet 15
K60 Column Lock Module CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K61 Sunroof Control Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K69 Transfer Case Control Module CAN 3 Scan Tool Does Not Communicate with Device on CAN 3 
K71 Transmission Control Module
  • CAN 2
  • Local Interconnect Network (LIN)
K73 Telematic Control Module
  • CAN 5
  • Ethernet 4
K77 Remote Function Actuator Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K85P Restraints Occupant Classification System Module - Passenger CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K99 Steering Column Tilt Wheel and Telescope Control Module Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K111 Fuel Pump Power Control Module Powertrain CAN DTC U0076
K124 Image Processing Module
  • CAN 1
  • CAN 2
  • CAN 8
  • Ethernet 11
  • Local Interconnect Network (LIN)
K134D Front Seat Bolster Memory Module - Driver Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K134P Front Seat Bolster Memory Module - Passenger Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
K157 Video Processing Module CAN 1 Scan Tool Does Not Communicate with Device on CAN 1 
K160 Brake System Control Module
  • CAN 1
  • CAN 2
  • Local Interconnect Network (LIN)
K161 Vehicle Performance Data Recorder
  • CAN 5
  • Ethernet 15
K164 Differential Control Module CAN 2 Scan Tool Does Not Communicate with Device on CAN 2 
K179 Automated Driving Mapping Module
  • CAN 8
  • Ethernet 3
  • Ethernet 11
K180 Driver Monitoring System Module CAN 2 Scan Tool Does Not Communicate with Device on CAN 2 
K182 Parking Assist Control Module
  • CAN 1
  • CAN 2
K212 Gear Shift Control Module
  • CAN 3
  • Powertrain CAN
K219 Lighting Control Module CAN 2 Scan Tool Does Not Communicate with Device on CAN 2 
M4P Programmable Air Inlet Valve Actuator Local Interconnect Network (LIN) DTC U0600-U06FF
M6PL Programmable Temperature Valve Actuator - Left Local Interconnect Network (LIN) DTC U0600-U06FF
M6PR Programmable Temperature Valve Actuator - Right Local Interconnect Network (LIN) DTC U0600-U06FF
M10 Charge Air Cooler Coolant Pump Local Interconnect Network (LIN) DTC U0600-U06FF
M37P Programmable Mode Valve Actuator Local Interconnect Network (LIN) DTC U0600-U06FF
M74D Front Side Door Window Regulator Motor - Driver Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
M74P Front Side Door Window Regulator Motor - Passenger Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
M96 Front Bumper Shutter Actuator Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
P2 Automatic Transmission Control Indicator Local Interconnect Network (LIN) DTC U0600-U06FF
P16 Instrument Panel Cluster Control Module
  • CAN 5
  • Ethernet 7
  • Local Interconnect Network (LIN)
P29 Head-Up Display Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
Q97 Engine Coolant Flow Control Valve Local Interconnect Network (LIN) DTC U0600-U06FF
S26 Hazard Warning Switch Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S64D Front Seat Adjuster Switch - Driver Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S64P Front Seat Adjuster Switch - Passenger Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S70R Radio Control Switch - Steering Wheel Local Interconnect Network (LIN) DTC U1100-U12FF
S79D Front Side Door Window Control Switch - Driver Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S79LR Rear Side Door Window Switch - Left Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S79P Front Side Door Window Switch - Passenger Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S79RR Rear Side Door Window Switch - Right Local Interconnect Network (LIN) DTC U0100-U02FF (Using Digital Multimeter)DTC U0100-U02FF (Using Network Communication Status)
S91 Parking Brake Control Switch Local Interconnect Network (LIN) DTC U1100-U12FF
S165 Infotainment Control Switch
  • CAN 5
  • Infotainment CAN
T3 Audio Amplifier
  • CAN 5
  • Ethernet 6
T19 Multifunction Power Supply Converter Powertrain CAN DTC U0076
T22 Wireless Accessory Charging Module CAN 5 Scan Tool Does Not Communicate with Device on CAN 5 
V1 Passenger Compartment Air Filter Module Local Interconnect Network (LIN) DTC U1100-U12FF
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