Chevrolet Bolt EV Schematic Wiring Diagrams
Detailed electrical diagrams of the Chevrolet Bolt EV electrical system (2017-2020). The manual provides wiring diagrams, relay and fuse locations, and connections for the main components of the high-voltage and low-voltage systems. These materials help in diagnosing faults, repairing electrical systems, and servicing an electric vehicle.
Common Electrical and Wiring Issues with the Bolt EV
🔋 High Voltage System (HV)
Worn out or damaged HV battery → capacity loss, cell errors.
Battery overheating due to cooling system failure (circulation pump, heat exchanger).
Problems with HV connectors and harnesses → moisture causes corrosion, which causes errors.
🔌 Charging and inverter
Charging unit failures (OBC – Onboard Charger) → the car does not accept charging.
Problems with the J1772/CCS charging connector (overheating, poor contact).
Errors with the inverter (DC-DC converter), especially with voltage drops.
💡 Lighting and low-voltage electrical systems (12V)
Weak resource of the standard 12V battery → fast discharge.
Relay and fuse failures in lighting and auxiliary circuits.
Headlight and taillight wiring harness problems → oxidation, wire breakage.
🖥️ Electronic units and sensors
ECU and firmware update failures.
Battery sensor errors (BMS – Battery Management System).
Unstable operation of multimedia and instrument panel.
🚗 Typical wiring damage locations
Trunk harness → wire breaks when opening/closing the lid.
Underbody harnesses → susceptible to moisture and reagents.
Ground connections → corrosion leads to chaotic errors.