Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSATURN2009ASTRA XR, 4D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSDATA COMMUNICATIONS
2009 Saturn Astra XR, 4D Hatchback, Automatic
Data Communications
2009 Saturn Astra XR, 4D Hatchback, AutomaticSECTION Data Communications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Data Communications
- Control Module U Code List
- DTC B1000
- DTC B1001
- DTC B1006
- DTC B1016
- DTC U0100-U0299
- Diagnostic Instructions
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC U1500
- DTC U2100
- DTC U2101
- DTC U2105-U2199
- DTC U2201
- Symptoms - Data Communications
- Scan Tool Does Not Power Up
- 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
- Data Link References
- Description and Operation
- Body Control System Description and Operation (Rear Electrical Center)
- Body Control System Description and Operation (Steering Column Control Module)
- SCCM
- SCCM Control Unit
- Notes
- Voltage Management, Voltage Supply, Ignition Lock
- Bus Interface to the High-Speed CAN (HS CAN) and Low-Speed CAN (LS CAN)
- Diagnostics Interface
- Dimming the Steering Wheel Controls Illumination
- Turn Signals Function
- Cruise Control Function
- Windscreen Wiper Function
- Horn Function
- Immobilizer Function (Immobilizer 3)
- Loudspeaker Function
- Steering Wheel Controls Function (Optional Equipment)
- Info Display Function (Optional Equipment)
- Steering Wheel Position Function
- Air Bag Firing Signal
- Key Remote Control Function
- Main/dipped Beam Function
- Key Locking Function
- Starter Control Function
- Active/Select One-Touch Buttons Function
- Body Control System Description and Operation (Underhood Electrical Center)
- Data Link Communications Description and Operation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.