The manual lists BYD Cloud Service registration, an NFC-equipped car and a compatible device as prerequisites. Inside the car, use the interior NFC mark to authorise starting and start promptly. Test both steps with the physical key handy before relying on a phone.

BYDbase editorial guide. This guide follows the Middle East manual. Check the edition and equipment for your own vehicle.

Source: BYD SEALION 7 Owner’s Manual (EN), Locking/Unlocking with NFC Key and Using the NFC Digital Key, printed pp. 50, 160–161 (PDF pp. 50, 160–161). The download requires a forum sign-in.

NFC reader area marked on the driver-side mirror of the SEALION 7. Illustration from the BYD owner’s manual, printed p. 50 (PDF p. 50).