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Home >> Cadillac >> 2023 >> LYRIQ Debut Edition >> Repair and Diagnosis >> Electrical >> Charging Systems >> Plug-In Charging System >> Diagnostic Information and Procedures >> DTC P3027-P3029 >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ensure the Battery Charger Coupler Lock is in the UNLOCKED position.
  2. Vehicle Off.
  3. Disconnect the electrical connector: X98 Battery Charger Coupler
  4. Test for less than 5 ohms between the test points:
    • Low Reference circuit terminal X2-11 & Ground - With K28/K20 
    • Low Reference circuit terminal X2-12 & Ground - With K2W 
    • If 5 ohms or greater 
    1. Disconnect the appropriate electrical connector: K16 Battery Energy Control Module
    2. Test for less than 2 ohms between the test points:
      • Low Reference circuit terminal X2-11 @ Component harness & The other end of the circuit @ Control module harness - With K28/K20 
      • Low Reference circuit terminal X2-12 @ Component harness & The other end of the circuit @ Control module harness - With K2W 
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K16 Battery Energy Control Module
    • Go to next step: If less than 5 ohms 
  5. Vehicle On, in Service Mode.
  6. Test for 4.8 to 5.2 V between the test points:
    • Signal circuit terminal X2-10 @ Component harness & Ground - With K28/K20 
    • Signal circuit terminal X2-11 @ Component harness & Ground - With K2W 
    • If less than 4.8 V 
    1. Vehicle Off.
    2. Disconnect the appropriate electrical connector: K16 Battery Energy Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal X2-10 @ Component harness & Ground - With K28/K20 
      • Signal circuit terminal X2-11 @ Component harness & Ground - With K2W 
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: The appropriate Signal circuit terminal @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K16 Battery Energy Control Module
    • If greater than 5.2 V 
    1. Vehicle Off.
    2. Disconnect the appropriate electrical connector: K16 Battery Energy Control Module
    3. Vehicle On, in Service Mode.
    4. Test for less than 1 V between the test points:
      • Signal circuit terminal X2-10 @ Component harness & Ground - With K28/K20 
      • Signal circuit terminal X2-11 @ Component harness & Ground - With K2W 
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K16 Battery Energy Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Test or replace the component: X98 Battery Charger Coupler
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