I have had that....but my issue was headlamps wouldn't turn on...
I bought a used BCM on e bay, and had to send away (cant remember the business name) both units for re coding....as I recall, total cost about £150 ...
Removing and re fitting BCM was not difficult, or long time wise to fit .
Try to make sure that the "used" BCM that you buy, is fully working......from the vendor.