For 1990-2009 cars

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
Advanced Parking Assist Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Body Control Module |

• | High Speed GMLAN

• | Mid 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 Mid Speed GMLAN Device

• | Scan Tool Does Not Communicate with Low Speed GMLAN Device

• | DTC U1500-U15BF

Chime Alarm Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Compass Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Content Theft Deterrent Sensor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Digital Radio Receiver Control Module | Mid Speed GMLAN | Scan Tool Does Not Communicate with Mid Speed GMLAN Device
Driver Door Switch Panel Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Driver Mirror Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Electronic Brake Control Module | Chassis High Speed GMLAN | 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
Front Seat Heating Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low 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 High Beam Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
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
Infotainment Faceplate Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Inside Rear View Mirror | Local Interconnect Network (LIN) | DTC U1500-U15BF
Instrument 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
Left Front Window Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Left Headlamp Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Left Rear Door Switch Panel Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Left Rear Window Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Liftgate Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Memory Seat Control Module | Low Speed GMLAN Local Interconnect Network (LIN) |

• | Scan Tool Does Not Communicate with Low Speed GMLAN Device

• | DTC U1500-U15BF

Mobile Telephone Control Module |

• | Mid Speed GMLAN

• | Low Speed GMLAN

• | Scan Tool Does Not Communicate with Mid Speed GMLAN Device

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

Multi-axis Acceleration Sensor Module | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High 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
Parking Heater Control Module (GME Only) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Door Switch Panel Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Passenger Mirror Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Passenger Presence Detection Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Power Sounder Content Theft Deterrent Alarm Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Radio (Base) |

• | 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 (High Content Navigation) |

• | 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 (In-Dash CD Changer) |

• | 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 (Medium Content Navigation) |

• | 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 (Rear Seat Entertainment Lite) |

• | 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

Rain/Ambient Light Sensor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Rear Differential Clutch Control Module | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Remote Heater and Air Conditioning Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device
Right Front Window Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Right Headlamp Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Right Rear Door Switch Panel Control Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Right Rear Window Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Steering Angle Sensor Module | 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 Sunshade Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Sunroof Window Motor Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Suspension Control Module | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Tire Pressure Sensor Locator Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Trailer Interface 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
Transmission Range Indicator Module | Local Interconnect Network (LIN) | DTC U1500-U15BF
Variable Power Steering Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device
Vehicle Communication Interface Module (VCIM) |

• | 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

Vehicle Direction Camera Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device