Hello Guys!
I have a 407 Coupe 2.7 V6. I bought the car with the RT4 radio missing because the previous owner sent it to repair to a guy and never got it back from him. I bought the car from him and a guy had an RT4 radio so we tried to fit it in my car it didn't boot up you could hear the CD player working and it woke the electronics up but no picture on the screen. It was an RT3 D2A radio (it has the black box on the side of it so as i know it is RT4 and totally different connectors than RT3 which is in my other car) so i bought the same type of radio the issue is the same as i described. DIAGBOX says communication error with radio and telematics. It gots 12 Volts i measured CAN High and Low in the FAKRA connector it was 4,4 V and the other 0,5 V while disconnected is this value okay guys?