LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Control System >> Diagnostic Information and Procedures >> DC Power Conversion Test >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

NOTE:

If a carbon pile tester and ammeter is available, refer to With Carbon Pile Tester section. Otherwise, refer to Without Carbon Pile Tester section.

With Carbon Pile Tester

    NOTE:

    Requires carbon pile tester rated to a minimum 200 amps along with either a built-in ammeter or a clamp-on ammeter.

  1. Vehicle ON.
  2. Verify that no K1 14 V Power Module or B18 Battery Current Sensor DTCs are set that would cause a charging system concern.
    • Go to next step: If no applicable DTCs are set 
  3. Vehicle OFF.
  4. Test for 12.4 V or greater at room temperature across the C1 Battery terminals.
    • Go to next step: If within the specified range 
    5. NOTE:

    If using a clamp-on ammeter, place it around the C1 Battery negative cable.

  5. Connect a carbon pile tester to the C1 Battery.
  6. Vehicle ON, turn all accessories off. Observe the voltage reading on the tester. The voltage should read between 12.6 - 15.5 V.
  7. Adjust the carbon pile tester so that the ammeter is reading 160 amps.
  8. Verify the voltage reading remains between 12.6 - 15.5 V.
    • If not within the specified range 

      Replace the K1 14 V Power Module.

    • Go to next step: If within the specified range 
  9. All OK.

Without Carbon Pile Tester

  1. Vehicle ON.
  2. Verify that no K1 14 V Power Module or B18 Battery Current Sensor DTCs are set that would cause a charging system concern.
    • Go to next step: If no applicable DTCs are set 
  3. Vehicle OFF.
  4. Test for 12.4 V or greater at room temperature across the C1 Battery terminals.
    • Go to next step: If within the specified range 
  5. Vehicle ON.
  6. Verify the scan tool Engine Control Module Ignition 1 Signal parameter continually increases when controlling the Engine Control Module 14 V Power Module Setpoint from 10 - 80% with a scan tool. It may take up to 10 s for the battery voltage to stabilize between each setpoint change.
    • If the battery voltage does not continually increase 

      Replace the K1 14 V Power Module.

    • Go to next step: If the battery voltage continually increases 
  7. All OK.
scientia non olet · About LEMON Manuals