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 PROCEDURESDTC U2201CIRCUIT/SYSTEM TESTING
2009 Saturn Astra XR, 4D Hatchback, Automatic
Circuit/System Testing
2009 Saturn Astra XR, 4D Hatchback, AutomaticSECTION Circuit/System Testing
NOTE:
Use the schematic to identify the following:
- Control modules the vehicle is equipped with
- Control module locations on the mid speed GMLAN serial data circuit
- The control modules B+, ignition, ground, communication enable and serial data circuit terminals
- Ignition OFF, disconnect the harness connector of the radio.
- Test for less than 5 Ξ© between each ground circuit terminal and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Verify that a test lamp illuminates between each B+ circuit terminal and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits for a short to ground. If the circuits test normal, replace the radio.
- If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits for a short to ground. If the circuits test normal, replace the radio.
- Ignition OFF for 60 seconds, test for less than 5 Ξ© between the radio connector terminals and DLC terminals listed below:
- Radio connector terminal 9 and DLC terminal 3
- Radio connector terminal 10 and DLC terminal 11
- If greater than the specified range, test the serial data circuit for an open/high resistance between the radio and a module setting the DTC.
- If all circuits test normal, replace the radio.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.