BYD Sealion 06 EV: Backup Power Supply Fault Diagnosis

Attempting to troubleshoot the backup power supply fault on the BYD Sealion 06 EV without the proper factory procedures risks misdiagnosis or unnecessary component replacement. By referring to the OEM Wiring diagram, you will identify and trace the backup power supply's relevant supply, protection, and output connections, helping you systematically investigate the source of the fault.

This diagram helps answer these questions​

1. How do you diagnose a BYD Sealion 06 EV backup power supply fault?
2. How do you test the backup power supply circuit?
3. How do you trace the backup power supply output circuit?
4. How do you identify the protection circuit for the BYD Sealion 06 EV backup power supply?
5. How do you identify the relevant supply circuits for the backup power system?
6. Which circuit diagram is needed to diagnose a BYD Sealion 06 EV backup power supply fault?
7. How are the backup power supply circuits connected to the USB charging and wireless phone charging systems?

How to Access the Diagram​

To access the wiring diagram, simply click on the link below. Within the diagram, you will find the Backup Power Supply Circuit Diagram. I have attached a screenshot below to help you quickly navigate to the section where the diagram is located. Once you find it, you can then print or save it.

Please note that the year in the document is not the YOM but the document release date, so it covers the entire model range. Also note that the document applies to all countries where the model is sold, including China, South Africa, Singapore, the UK, Australia, New Zealand, Thailand, Brazil, Canada, etc.