Without Carbon Pile Tester

Vehicle ON.
Verify that no K1 14 V Power Module or B18 Battery Current Sensor DTCs are set that would cause a charging system concern.
- If an applicable DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no applicable DTCs are set
Vehicle OFF.
Test for 12.4 V or greater at room temperature across the C1 Battery terminals.
- If not within the specified range
  Refer to Battery Inspection/Test .
- If within the specified range
Vehicle ON.
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.
- If the battery voltage continually increases
All OK.