XSeries-forum

As this is a possible cause of non functioning remotes for locking/unlocking, is there any way to ascertain if its the culprit? Buying a used one is not difficult but if the radio functions perfectly, is the aerial really a candidate? Is it frequency sensitive and does it need coding ? I've seen a number for sale with E70 clearly printed on them, but assumptions can be dangerous.

The company that supplied one new key and reprogrammed both to the car have advised that if the diversity antenna is replaced, they will need to sync the keys to it, so another visit and cost factor. BMW scanning locally is now £220 an hour

It could be wiring in the tailgate loom but for the life of me i can't see how to even access the wiring inside the grommet. I thought i could live with manual locking, but its become a PITA quite quickly.

No mention in the TIS of any recoding being needed. The Car Access System signal comes out of the diversity unit on a Blue/Red wire from Pin 3 on the left hand side of the module. It runs to the CAS module that is inside the dash. The wire arrives at Pin 33 via a connector in the upper dash behind the glovebox.

Re-pairing might be needed but there’s no specific mention of it. The diversity unit might have a frequency ‘tap’ that detects the key signal. The tap is a tuned circuit designed for the key frequencies.

Thank you. Short of cutting open the tailgate grommets to check for broken wiring, ill have to gamble on a used diversity antenna. In theory i can always resell it i suppose, doubtless at a loss though