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 MANUALSCHEVROLET2009UPLANDER LT, 3.9 MREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZERDIAGNOSTIC INFORMATION AND PROCEDURESHOOD AJAR INDICATOR/MESSAGE MALFUNCTIONCIRCUIT/SYSTEM TESTING
2009 Chevrolet Uplander LT, 3.9 M
Circuit/System Testing
2009 Chevrolet Uplander LT, 3.9 MSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the hood ajar switch.
- Test for less than 10 ohms between the ground circuit terminal B and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Connect the harness connector at the hood ajar switch. Disconnect the X1 harness connector at the BCM.
- Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 26 and ground.
- If the test lamp illuminates, test the signal circuit for a short to voltage.
- Ignition OFF, hood closed, test for 700-800 ohms between the signal circuit terminal 26 and ground.
- If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the hood ajar switch.
- Hood open, test for 6K-8K ohms between the signal circuit terminal 26 and ground.
- If not within the specified range, test or replace the hood ajar switch.
- If all circuits test normal, replace the BCM.
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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.