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HOMESERVICE MANUALSCHEVROLET2009UPLANDER LT, 3.9 MREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZERDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3055CIRCUIT/SYSTEM TESTING
2009 Chevrolet Uplander LT, 3.9 M

Circuit/System Testing

2009 Chevrolet Uplander LT, 3.9 MSECTION Circuit/System Testing

Exciter Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the theft deterrent exciter.
  2. Ignition OFF, test for less than 10 ohms of resistance between the low reference circuit terminal C and ground.
    • If greater than the specified range test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Test for less than 10 ohms of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range test the ground circuit for an open/high resistance.
  4. Ignition ON, test for B+ between the B+ circuit terminal A and ground.
    • If not the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the theft deterrent exciter.
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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.