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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Fuel Filler Door Release Malfunction (NO8) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON.
  2. Test for less than 1 V between the control circuit terminal 1 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the A23D Door Latch Assembly - Driver and the M97 Fuel Door Lock Actuator, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V 
  3. Ignition OFF, connect the X6 harness connector at the K9 Body Control Module. Disconnect the harness connector at the M97 Fuel Door Lock Actuator, ignition ON.
    4. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 s may cause the K9 Body Control Module to interpret the test as a system fault and will cause the voltage on the control circuit to drop to 0 V. If the voltage drops to 0 V, operate the door locks using the door lock switch to restore the voltage for testing.

  4. Test for greater than 3 V between the control circuit terminals listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 3 V or less 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If greater than 3 V 
    5. NOTE:

    When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 00.00 V.

  5. Install a DMM between the control circuit terminal 1 and control circuit terminal 2. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 00.00 V.
  6. Lock and unlock the vehicle doors using the door lock switch.
  7. Verify the MAX voltage captured by the DMM is greater than 10 V.
    • If 10 V or less 

      Replace the K9 Body Control Module.

    • If greater than 10 V 
  8. Test or replace the M97 Fuel Door Lock Actuator.
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