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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 95 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> DTC P0AA1, P0AA4, P0AD9, P0ADB-P0ADD, P0ADF, P0AE0, P0AE4, P0AE6, P0AE7, or P1EC0 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle in Service Mode.
  2. Verify that DTC P0AD9, P0ADB, P0ADC, P0ADD, P0ADF, P0AE0, P0AE4, P0AE6, P0AE7 or P1EC0 is not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing.

    • Go to next step: If none of the DTCs are set 
  3. Verify that DTC P0AA1 and/or P0AA4 is set without any of the above Contactor Control Circuit DTCs.
    • If the DTC is set 

      Replace the A28 Hybrid/EV Battery Contactor Assembly.

    • Go to next step: If the DTC is not set 
  4. Verify that DTC P0C78 is not set.
    • Go to next step: If the DTC is not set 
    5. NOTE:

    The following setup steps must be performed exactly in order to exercise the contactors.

  5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  6. OPEN the driver door using outside door handle. Leave driver door OPEN.
    7. NOTE:

    The brake pedal must remain depressed throughout the remainder of the contactor steps.

  7. PRESS and HOLD the brake pedal.
    8. NOTE:

    DO NOT press the power button and enter Vehicle in Service Mode.

  8. Command the Hybrid/EV Battery Contactors ALL OPEN with a scan tool.
  9. Disconnect the S15 Manual Service Disconnect.
    10. NOTE:

    DO NOT use the scan tool Release Control button to turn OFF any of the contactors. Once the Release Control button is pushed the Circuit/System Verification will need to be restarted from the beginning.

  10. Command the Hybrid/EV Battery Negative Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
    11. NOTE:

    It is normal for the contactors to only make noise while opening.

  11. Verify the Hybrid/EV Battery Negative Contactor is heard opening.
    • If the Hybrid/EV Battery Negative Contactor operation cannot be heard 

      Refer to Circuit/System Testing.

    • Go to next step: If the Hybrid/EV Battery Negative Contactor operation is heard 
  12. Command the Hybrid/EV Battery Positive Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
  13. Verify the Hybrid/EV Battery Positive Contactor is heard opening.
    • If the Hybrid/EV Battery Positive Contactor operation cannot be heard 

      Refer to Circuit/System Testing.

    • Go to next step: If the Hybrid/EV Battery Positive Contactor operation operation is heard 
  14. Command the Hybrid/EV Battery Precharge Contactor between CLOSED and ALL OPEN with a scan tool while listening for the contactor to open.
  15. Verify the Hybrid/EV Battery Precharge Contactor is heard opening.
    • If the Hybrid/EV Battery Precharge Contactor operation cannot be heard 

      Refer to Circuit/System Testing.

    • Go to next step: If the Hybrid/EV Battery Precharge Contactor operation is heard 
  16. All OK.
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