1) Plug ECRI device into OBD Port2) Open ECRI app on smart-device (iOS and Android supported)3) Bluetooth will connect automatically4) Scroll down to "LED Turn Signals"5) Tap the toggle to turn them on6) Tap "Write Programming"7) Tap "Confirm"8) Tap "OK" when finished. 9) Turn the ignition off, remove the key open the door and wait for modules to power down.