FIRST Turn ON cars ignition (one position before engine starts). And only then…
Plug ELM327 Bluetooth scanner into cars connector.
Touch Settings » Wireless & Networks » Check the Bluetooth box and go to » Bluetooth Settings.
From here — scan for devices and ELM327 Bluetooth scanner will show up as either: ELM, ELM327, CAN, OBD, etc.
When you’re asked for passcode to pair, enter: 6789
If “6789” doesn’t work, then try “1234” or “0000“.