Circuit/System Verification
- Perform the Battery Inspection/Test .
- Engine running.
- Verify that no DTCs are set that would cause a high voltage system concern or a 12V charging system concern.
- If an applicable DTC is set
Refer to: Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no applicable DTCs are set
- If an applicable DTC is set
- With a scan tool, verify the Hybrid/EV Powertrain Control Module 2 parameters Hybrid/EV Battery Positive Contactor Command and Hybrid/EV Battery Negative Contactor Command each indicate Closed.
- If the contactors are not commanded Closed
Refer to Clear Secured High Voltage DTCs .
- Go to next step: If the contactors are commanded Closed
- If the contactors are not commanded Closed
- Ignition Off.
- Measure and record the C1 Battery Voltage at the C1 Battery terminals. The C1 Battery Voltage should stabilize within a few minutes of turning the ignition/vehicle OFF.
- Engine running, daytime running lamps and all accessories OFF.
- Measure and record the C1 Battery Voltage at the C1 Battery terminals. The voltage should be at least 1 V greater than the voltage measured with the engine OFF, but less than 15.5 V.
- If not within the specified range
Refer to Circuit/System Testing.
- Go to next step: If within the specified range
- If not within the specified range
- All OK.
NOTE:
To accurately diagnose the charging system, the C1 Battery must be fully charged and capable of passing the Battery Inspection/Test.
NOTE:
The engine must be started at least once during a key cycle to enable high voltage and the 14 V Power Module. The 14 V Power Module and high voltage will remain enabled during any subsequent Autostops.