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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1867 (DOOR LOCK SYSTEM AND DOOR HANDLES)DIAGNOSTIC INFORMATION AND PROCEDURESLIFTGATE RELEASE MALFUNCTIONCIRCUIT/SYSTEM TESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Circuit/System Testing

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the liftgate release switch.
  2. Test for less than 1 ohm between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for infinite resistance between the signal terminal B and the ground terminal A with the switch in the open position.
    • If not the specified value, replace the liftgate release switch.
  4. Test for less than 2 ohms between the signal terminal B and the ground terminal A with the switch in the closed position.
    • If greater than the specified range, replace the liftgate release switch.
  5. Test for greater than 10 volts between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM.
  6. Ignition OFF, connect the harness connector at the liftgate release switch and disconnect the harness connector at the liftgate latch assembly.
  7. Test for less than 1 ohm between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  8. Connect the harness connector at the liftgate latch and disconnect the X1 harness connector at the I/P fuse block.
  9. Verify that a test lamp does not illuminate between the control circuit terminal 23 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  10. Connect a 10A fused jumper wire between the control circuit terminal 23 and B+. Verify that the liftgate latch activates.
    • If the liftgate latch does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the liftgate latch assembly.
  11. Ignition OFF, connect the X1 harness connector at the I/P fuse block and disconnect the X4 and X7 harness connectors at the BCM.
  12. Connect a 10A fused jumper wire between the control circuit terminal 13 and B+. Verify the liftgate latch does not activate
    • If the liftgate latch activates, test the control circuit terminal 22 for a short to ground. If the circuit tests normal replace the I/P fuse block.
    • If the jumper wire fuse opens, test the control circuit terminal 13 for a short to ground. If the circuit tests normal replace the I/P fuse block.
  13. Briefly connect another jumper wire between the control circuit terminal 22 and ground. Verify the liftgate latch activates.
    • If the liftgate latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal replace the I/P fuse block.
  14. If all circuits test normal, replace the BCM.
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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.