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 COMMUNICATIONSDIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH LOW SPEED GMLAN DEVICECIRCUIT/SYSTEM TESTINGLS GMLAN INITIAL TEST
2009 Saturn Astra XR, 4D Hatchback, Automatic
LS GMLAN initial test
2009 Saturn Astra XR, 4D Hatchback, AutomaticSECTION LS GMLAN initial test
- Ignition OFF, disconnect the X1 harness connector at the steering column control module (SCCM).
- Ignition ON, test for less than 1.0 volt between the low speed GMLAN serial data circuit of the DLC and ground.
- If greater than the specified range, test the serial data circuit for a short to voltage.
- Test for infinite resistance between the serial data circuit of the DLC and ground.
- If less than infinite resistance, test the serial data circuit for a short to ground.
- Test for less than 1.0 ohm in the serial data circuit between the DLC and the SCCM.
- If greater than the specified range, test the serial data circuit for an open/high resistance.
- Disconnect the X1 harness connector at the SDM, install a 3A fused jumper wire from the SDM terminal 35 to the harness side of X1.
- With a scan tool, attempt to communicate with the IPC.
- If communication is established, refer to Diagnostic 2.
- If communication is not established, refer to Diagnostic 1.
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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.