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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.

Trunk Release Switch Inoperative

  1. Ignition OFF, disconnect the harness connector at the S58A rear compartment lid unlatch switch-exterior.
  2. Ignition ON, test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify the scan tool Trunk Lid/Liftglass Exterior Unlatch Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Trunk Lid/Liftglass Exterior Unlatch 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 K9 BCM.
  5. If all circuits test normal, test or replace the S58A rear compartment lid unlatch switch-exterior.

Release Actuator Inoperative

  1. Ignition OFF for 10 minutes, disconnect the KR95B rear compartment lid release relay.
  2. Test for less than 10 Ω between the ground circuit terminal 85 and ground.
    • If greater than the specified range, test for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 30 for a short to ground. If the circuit tests normal, test or replace the KR95B rear compartment lid release relay.
  5. Ignition OFF, disconnect the harness connector at the M40 rear compartment lid latch.
  6. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the M40 rear compartment lid latch.
  8. Ignition ON, connect a 10 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30. Verify the M40 rear compartment lid latch is activated.
    • If the M40 rear compartment lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the M40 rear compartment lid latch.
  9. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  10. Command the M40 rear compartment lid latch to UNLATCH with a scan tool. The test lamp should turn ON during the UNLATCH command.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 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 K9 BCM.
  11. If all circuits test normal, test or replace the KR95B rear compartment lid release relay.
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