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Home >> Saturn >> 2009 >> Vue Red Line, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1149 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Liftgate Release Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Liftgate Release Switch Malfunction

  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. Ignition ON, verify the scan tool Int Trunk/Liftglass Sw parameter is Inactive.
    • If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Int Trunk/Liftglass Sw parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM
  5. If all circuits test normal, test or replace the liftgate release switch.

Liftgate Release Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
  2. Connect a test lamp between the control circuit terminal 5 and B+.
  3. Command the liftgate latch assembly ON and OFF by pressing and releasing the liftgate release switch, the test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Connect a test lamp between the control circuit terminal 6 and ground.
  5. Command the liftgate latch assembly ON and OFF by pressing and releasing the liftgate release switch, the test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Ignition OFF, connect the X1 harness connector at the I/P fuse block. 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 a test lamp between the control circuit terminal 1 and ground.
  9. Command the liftgate latch assembly ON and OFF by pressing and releasing the liftgate release switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the I/P fuse block.
    • If the test lamp is always OFF and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace I/P fuse block.
    • If the test lamp is always OFF and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the liftgate latch assembly.
  10. If all circuits test normal, test or replace the liftgate latch assembly.
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