The Alarm in my 2005 D3 started going off for no reason this morning.

After taking it to the LR specalist they don't know what the problem was but cleared the faults for me. They reckon i most likely need a new BCM but i reckon there must be an easier fix.

BCM Fault Codes are as Follows

B1B01-4A: Key Transponder
* Incorrect Component Installed

B1B02-28: Low Frequency Coil
* signal bias level out of range/zero adjustment failure

Unknown Fault Code 9BA0

B1C57-14: Passive Start Ignition Relay Coil Circuit
* circuit to ground or open

B1D12-15: Volumetric Alarm Power Circuit
* circuit short to battery or open


What does this all mean exactly? my primary key fob stopped working about 6 months ago so i started using my wife's one that was in the drawer, usually its the ones in the drawer that stop working. I don't want to spend $2k upwards for something if i dont have to.

Cheers