Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

WARNING:
- The nominal high voltage traction battery voltage is 330 volts DC. The buffer zone must be set up and insulated rubber gloves and a face shield must be worn. Failure to follow these instructions may result in severe personal injury or death.
- The high voltage traction battery (HVTB) and charging system contains high voltage components and wiring. High voltage cables and wiring are orange in color. High voltage insulated safety gloves and a face shield must be worn when carrying out any diagnostics on this vehicle. Failure to follow these instructions may result in severe personal injury or death.
- Before carrying out any removal and installation procedures of the high voltage traction battery (HVTB) system, the high voltage traction battery must be depowered. Failure to follow these instructions may result in severe personal injury or death.
- The rubber insulating gloves that are to be worn while working on the high voltage system should be of the appropriate safety and protection rating for use on the high voltage system. They must be inspected before use and must always be worn in conjunction with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high voltage. Failure to follow these instructions may result in severe personal injury or death.
- High voltage insulated safety gloves and a face shield must be worn when working with high voltage cables. The ignition switch must be OFF for a minimum of 5 minutes before removing high voltage cables. Failure to follow these instructions may result in severe personal injury or death.
- The buffer zone is required only when working with the high voltage system. Failure to follow these instructions may result in severe personal injury or death.

1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
- AC powerpoint
- DC/AC inverter
- DC/DC converter
- Smart junction box (SJB) fuse 35 (5A)
- Battery junction box (BJB) fuse 14 (30A)
- Circuitry

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 data link connector (DLC).

5. NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided 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 Information Bus (Module Communications Network), No power to the scan tool, to diagnose no communication with the scan tool.

6. If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- refer to Information Bus (Module Communications Network) to diagnose no response from the powertrain control module (PCM).

7. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Information Bus (Module Communications Network).
- If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).

8. Clear the continuous DTCs and carry out the self-test diagnostics for the powertrain control module (PCM).
9. If the DTCs retrieved are related to the concern, go to Computers and Control Systems. For all other DTCs, refer to Antitheft and Alarm Systems.
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures