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Hello, I would like to turn on my C350e Plug-in hybrid pre-conditioning system remotely via some kind of microcontroller board (Arduino, ESP32, ETC.).
Right now, my car has no Mercedes Me connect or any online features since these features were not supported in my country at the time I bought this car. I'm a software engineer and I think I can implement the remote pre-entry function on my own. However, I have zero knowledge in automotive and in-car networking.
Right now my super hacky solution was to attach servo motor and make it press the pre-entry button for me remotely. (
) This button works even the car is locked. Another way to activate pre-entry climate is to set the departure time in the instrument cluster.
My plan is to tap into CAN-B and observe the values on the bus. Once I found the corresponding value, I will resend the CAN message and it should work, right?
What I'm not sure yet is does the pre-conditioning CAN message is really transmitting via CAN-B, It might transmit via CAN-H (hybrid CAN) since this feature is only available on a hybrid model. And there are lots of CAN message transmitting in CAN Bus in a second, which tools/software should I use for CAN Bus reverse engineering.
Could anyone guide me in the right direction, Thank you very much.
Alternatively, buy one 4G switch from China $50 at most, then from your smart phone you will have some buttons in one app. To do this job easily.
in the car you need open the AC switch panel then find the two contact points of that button. Then hide the small switch behind it. It will work for sure.
but you need buy one extra SIM card for this and pay monthly for the data. If you think it worth the spending, go ahead. One more thing is the power supplier issue. You need source the lowest standby current device. So it won’t drain your battery. And if you need park the car for a long period: better cut off the power supplier.
So if you want to make it by yourself, it will be more fun. But if just for this function, not necessary to dig into the CAN BUS. Just my two cents
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Send command via CAN BUS
