The immobiliser is nothing to do with the battery in the keyfob, buttons or barcode, they are for the remote locking.
The immobiliser is a passive chip in the keyfob and is 'read' by the coil round the lock.
A new key is supplied with the chip already programmed to one of the codes held in the immobiliser ECU, the record of them is held by BMW in Germany.
Last edited by raykay; 9th April 2009 at 10:15..
|