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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Acadia, 2011 Chevrolet Traverse, and 2011 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

I/P Multifunction Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the I/P multifunction switch.
  2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool LGM Disable Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal 8 and ground. Verify the scan tool LGM Disable Switch 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 K39 liftgate control module.
  5. Verify the scan tool LGM Front Control Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  6. Install a 3A fused jumper wire between the signal circuit terminal 7 and ground. Verify the scan tool LGM Front Control Switch 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 K39 liftgate control module.
  7. If all circuits test normal, test or replace the I/P multifunction switch.

Liftgate Interior/Exterior Control Switch Inoperative

  1. Ignition OFF, disconnect the harness connectors at the exterior liftgate control switch and the interior liftgate control switch.
  2. Test for less than 20 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance.
  3. Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Liftgate Handle Sw. Status 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 K39 liftgate control module.
  5. Ignition OFF, connect the harness connector at the interior liftgate control switch.
  6. Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the interior liftgate control switch, the parameter should change between Active and Inactive.
    • If the value does not change, test or replace the interior liftgate control switch.
  7. If all circuits test normal, test or replace the exterior liftgate control switch.

Liftgate Object Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the B71L liftgate object sensor - left.
  2. Test for less than 30 Ω between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.
  3. Disconnect the harness connector at the B71R liftgate object sensor - right.
  4. Ignition ON, test for 4.75-5.25 V between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K39 liftgate control module.
  5. Test for less than 10 Ω between the signal circuit terminal A at the B71R liftgate object sensor - right and the signal circuit terminal B at the B71L liftgate object sensor - left
    • If greater than the specified range, test the signal circuit between the two sensors for an open/high resistance
  6. If all circuits test normal, test or replace the B71L liftgate object sensors.

Liftgate Latch Switches Malfunction

  1. Ignition OFF, disconnect the harness connector at the A23C liftgate latch assembly.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.
  3. Ignition ON, verify the scan tool LGM Latch Pawl Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2. Verify the scan tool LGM Latch Pawl 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 K39 liftgate control module.
  5. Verify the scan tool LGM Latch Ratchet Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 6 and low reference circuit terminal 2. Verify the scan tool LGM Latch Ratchet 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 K39 liftgate control module.
  7. Verify the scan tool LGM Latch Sector Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K39 liftgate control module.
  8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and low reference circuit terminal 2. Verify the scan tool LGM Latch Sector 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 K39 liftgate control module.
  9. If all circuits test normal, test or replace the A23C liftgate latch assembly.

Liftgate Latch Release/Cinch Malfunction

  1. Ignition OFF, disconnect the harness connector at the A23C liftgate latch assembly.
  2. Test for less than 5 Ω between the control circuit terminal 1 and ground
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the K39 liftgate control module.
  3. Test for less than 5 Ω between the control circuit terminal 3 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the K39 liftgate control module.
  4. Connect a test lamp between control circuit terminal 1 and ground.
  5. Ignition ON, command the liftgate to OPEN by pressing the interior liftgate control switch. The test lamp should illuminate while commanding the OPEN state.
    • 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 K39 liftgate control module.
    • If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the K39 liftgate control module.
  6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
  7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
  8. Ignition ON, command the liftgate to CLOSE by pressing the interior liftgate control switch. The test lamp should illuminate while commanding the CLOSE state.
    • 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 K39 liftgate control module.
    • If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the K39 liftgate control module.
  9. If all circuits test normal, test or replace the A23C liftgate latch assembly.

Liftgate Full Open Switch Malfunction

  1. Ignition OFF, disconnect the X3 harness connector at the K39 liftgate control module.
  2. Ignition ON, verify the scan tool LGM Full Open Switch parameter is Inactive.
    • If not the specified value, replace the K39 liftgate control module.
  3. Liftgate OPEN, test for less than 1 Ω between the signal circuit terminal 5 and the ground circuit terminal 6.
    • If greater than the specified range, replace the liftgate actuator assembly.
  4. Liftgate CLOSED, test for infinite resistance between the signal circuit terminal 5 and the ground circuit terminal 6.
    • If less than the specified value, replace the liftgate actuator assembly.
  5. If all circuits test normal, replace the K39 liftgate control module.

Liftgate Motor Power Open/Close Malfunction

  1. Ignition OFF, disconnect the X3 harness connector at the K39 liftgate control module.
  2. Test for infinite resistance between the control circuit terminal 1 and ground.
    • If greater than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the liftgate actuator assembly.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the liftgate actuator assembly.
  4. Verify that a test lamp does not illuminate between the control circuit terminal 1 and B+.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the liftgate actuator assembly.
  5. Test for infinite resistance between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the liftgate actuator assembly.
  6. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the liftgate actuator assembly.
  7. Verify that a test lamp does not illuminate between the control circuit terminal 2 and B+.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the liftgate actuator assembly.
  8. If all circuits test normal, replace the K39 liftgate control module.
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