[viki300]

Hi i got odd fault on this car has factory installed trailer hook when i add bike rack electrical connector on it a/c goes off i can hear that a/c combressor clutch clicks and no more cold air if disconnect connector it starts working again no faults on AHM or IHKA and i tried bike rack on other car works ok and just tryed with other trailer same problem so most like CAN problem but where i can start looking it FRM or something else and car is 2008 X5 3.0d