[Zuraczu]

hi

please for help , any hints appreciated

BMW f10 C283707 , 06/2010 came to me to add spare Key but Genuine key 868mhz unlock ignition only on steering wheel column aerial , works fine for locking unlocking though

i replaced battery in key , tested - it sends signal
I have added 2x aftermarket keys on bench, write it down to cas eeprom but they do not work at all

tested diversity antenna  near rear windowd  lin to cas for continuity , power and ground ok
checked interial aerial front and rear , if unpugged there is fault . they have 0.4 ohm i do not know how can i test
their signal etc

according to diagrams here should be 3 antenna on rear shelf and 2 luggage antennas but i was not able to found them

i also replaced rear diversity antenna , interior aerials , checked continuity to cas
flashed CAS4 with esys ,
i have no more ideas , any hints ?  replacing Cas 4 ?

[Matthew53]

If you don't have comfort access then you will not have luggage aerials. Did you check that battery is definitely well charged? Even the new one? I think this "undervoltage battery" fault wouldn't be written without any reason. I had situation that after FEM programming the ignition could only be started with steering aerial, I was looking few hours for solution, because before programming it was working well so I didn't really expect the battery, but it was.