Hi everyone. I.ve got an 03 vy berlina sedan. I had srs, abs, aircon and trac control alarms going off like mad and often the buttons on the key don.t unlock the doors or boot, so i took it to the mechanic. After quite a bit of money and buying an ecu/bcm/key combo from the wrecker to keep costs down and replacing burnt relays he thought he.s solved the problem. He said his scan gun said no communication from bcm. It was awesome, until today. I put the key in and before i.d even started it i had all those alarms come up again except the aircon, the door lock buttons on the key weren.t working properly either until i pulled the bcm fuse (the 10amp one under the bonnet) and put it back in. I heard a noise and thought hmmmm. Put the key back in and no codes. Could this be as simple as replacing the key battery or could it be a dicky wire from the bcm to its fuse or the bcm to the ecu? Is there anything else it could be? Input will be appreciated, thanks Gus.