peugeot 406 hdi , 2lt electronic immobiliser problem ?

could any one tell me if my car battery could cause my immobiliser problem? 2 weeks ago with the heavy frost i went out and my car would not open with remote key . i got in the door and tried starting car , it was turning over only , the immobiliser warning light was on , i had a mobile diagnostic lad out . i have ended up replacing . new key , aerial transponder ,comm 2000, and bpi all brand new ... and my car is still not running ? can any one give me advice on this ?