I have remote fob size transmitter switch from Ebay, works great up to around 2 km (I tested) . I will tap to ON/OFF climate switch. As SierraQ posted :
" •Can I leave the A/C or heater on for a passenger/pet? To do this for longer than the 15 minutes you get with carwings you have to leave the car on in ready to drive mode. You can take the fob with you and lock it with the remote. Do keep in mind that the car can be driven without the fob if it has already been started. (If you happen to be charging, the car must only be in ON mode and hence it cannot be driven.)"
Tapping to ON/OFF has advantage to set temperature instead fixed one by Carvings 70deg. Its way too hot for winter and waste of battery power. Also Carwings remote does not use heat pump for heating, only PTC heater.
I wish to find the way to hack to Carwings TCU climate ON output unit ,maybe someone in IT field has better knowledge?
2013 "Brilliant Silver" SL with Premium Package .
3.2 kW Solar.