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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Electrical >> Charging Systems >> Plug-In Charging >> Diagnostic Information and Procedures >> DTC P0D2B or P0D2C >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF, disconnect the X1 harness connector at the B305 Ambient Light/Sunload Sensor and Battery State of Charge Indicator.
  2. Test for less than 10 Ω between the low reference terminal 1 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 10 Ω 
    3. NOTE:

    If the drive motor battery charger cable is connected. The drive motor battery charger cable must be disconnected for more than 10 seconds before performing the next step.

  3. Connect a test lamp between the control circuit terminal 4 and ground.
  4. Verify the test lamp does not illuminate.
    • If the test lamp does illuminate 
    1. Disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If the test lamp does not illuminate 
  5. Connect the drive motor battery charger cable.
  6. Verify that the test lamp illuminates within the first 5 seconds of connecting the drive motor battery charger cable.
    • If the test lamp does not illuminate 
    1. Disconnect the drive motor battery charger cable. Disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the control circuit and ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: 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 in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If the test lamp does illuminate 
  7. Disconnect the drive motor battery charger cable for at least 10 seconds. Connect a test lamp between the control circuit terminal 3 and ground.
  8. Verify the test lamp does not illuminate.
    • If the test lamp does illuminate 
    1. Disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If the test lamp does not illuminate 
  9. Connect the drive motor battery charger cable.
  10. Verify that the test lamp illuminates within 25 seconds of connecting the drive motor battery charger cable.
    • If the test lamp does not illuminate 
    1. Disconnect the drive motor battery charger cable. Disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the control circuit and ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: 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 in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If the test lamp does illuminate 
  11. Replace the B305 Ambient Light/Sunload Sensor and Battery State of Charge Indicator.
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