DC to DC Converter Control Module (DC/DC) System

High-Voltage Converter/Inverter

Inspection and Verification - DC to DC Converter Control Module (DC/DC) System

WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart





3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the DLC.

5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground to the VCM.

If the scan tool does not communicate with the VCM:

- check the VCM connection to the vehicle.

- check the scan tool connection to the VCM.

- refer to Module Communications Network Testing and Inspection, No Power to the Scan Tool, to diagnose no power to the scan tool.

6. If the scan tool does not communicate with the vehicle:
- verify the ignition is ON.

- verify the scan tool operation with a known good vehicle.

- refer to Module Communications Network Testing and Inspection to diagnose no response from the PCM.

7. Carry out the Network Test.
- If the scan tool responds with no communication with one or more modules, refer to Module Communications Network Testing and Inspection.

- If the Network Test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous memory DTCs and carry out the self-test diagnostics for the DC/DC and PCM.

9. If the DTCs retrieved are related to this concern, go to the DC to DC Converter Control Module (DC/DC) DTC Chart or the PCM DTC Chart. DC To DC Converter Control Module (DC/DC) DTC Chart PCM DTC Chart

10. If no DTCs related to the concern are retrieved, GO to Symptom Chart - DC/DC Converter Control Module (DC/DC) System. Symptom Chart - DC To DC Converter Control Module (DC/DC) System