Mercedes c205 2017 radio/nav problem

[Plopek]

Hi
I have a problem with comand/ nav unit in Mercedes c 205 17reg.
Comand panel and screen keeps shutting off by itself
Then is back on again and then off
You can't turn it on by pressing anything.
I have checked the fuses etc
Any ideas?
Thanks in advance

[Plopek]

Update

For all members interested in the subject.

After successful installation of SERVICE SOFT "X" .
Program showed error :
b1f9712 the wake-up line has a malfunction. there is the short circuit to positive
and also other one something like lack of power to the Head Unit probably like consequence of the first error.
I went through everything again but nothing obvious .
The good thing was the wake-up line has only 3 devices.
1. display
2.head unit
3.Amp in the boot
all connectors good, no cracked wires.
Finally i decided to take out Head Unit out of the bracket .
Bingo
When I did there was something rattling inside.
That was 5p coin on pcb.
When removed all works well again.
I hope that will help someone in the future.

[GERCOMOTIVE]

Tell your customer that vehicle radios work without inserting a coin (for now)


Hahaha