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 COMMUNICATIONSDESCRIPTION AND OPERATIONBODY CONTROL SYSTEM DESCRIPTION AND OPERATION (STEERING COLUMN CONTROL MODULE)SCCM CONTROL UNITBUS INTERFACE TO THE HIGH-SPEED CAN (HS CAN) AND LOW-SPEED CAN (LS CAN)
2009 Saturn Astra XR, 4D Hatchback, Automatic
Bus Interface to the High-Speed CAN (HS CAN) and Low-Speed CAN (LS CAN)
2009 Saturn Astra XR, 4D Hatchback, AutomaticSECTION Bus Interface to the High-Speed CAN (HS CAN) and Low-Speed CAN (LS CAN)
- The SCCM has two CAN interfaces for data communication.
- High-speed CAN for engine systems, drive train systems, immobilizer, etc.
- Single wire low-speed CAN for body systems.
- Interface between HS CAN and LS CAN.
- The SCCM is the interface (transfer point) between the low-speed bus and the high-speed bus. Selected bus messages are transferred from the low-speed bus to the high-speed bus and vice versa.
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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.