1. Connect the Mini USB port of the hardwire kit to the power outlet of the main device (DC/IN). Start the engine and wait for the main device to turn on. If the main device fails to power on, check the power cable of the hardwire kit to see if it is correctly connected to the regular electric fuse
2. After the main device has turned on, turn off the engine and remove the key. Check if the main device powers off or enters sleep mode. For some cars, the ACC power off signal will only be triggered when the driver seat door is opened after the engine is turned off. Some car models will only trigger the ACC power off signal after the engine has been turned off for a certain period of time. For such cars, observe for some time after the ACC power is turn off to check if the main device powers off or enters sleep mode
3. After the main device powers off or enters sleep mode, restart the engine and check if the main device automatically turns on.