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For information sakes I thought i thought I would tag my recent experience on to this thread...
My 405 was booked in for constant “LOW BATTERY” warnings and my FHB had stopped working. They found a pump to be under powered so replaced it as it would have certainly failed completely soon afterward! But this was not the source of my issues! So, both batteries were new so they checked them and all was in order, they then found the battery management system was functioning incorrectly and telling the car the battery was low in charge! When it clearly wasn’t!
The fault was this. Every time I drove the car, the moment you turned the car off “beep, LOW BATTERY PLEASE START ENGINE “ would be displayed. If you didn’t drive the car for 3 or 4 days the car wouldn’t start BUT the batteries were still charged! You could even put it on its own Land Rover branded L405 trickle charger overnight and STILL Bong when you opened the door in the morning!!! Grrrrrrr 
So, Land Rover replaced the BMS brain and loaded all new software and it took a week of charging charging charging! Before the system finally worked! Now, the FBH works again and all is well when you leave the car a few days without starting... BIZZARE 
The moral to this post is this... Even if you put your car on a charger, this is not a sure fire way to prove the FBH system works! Due to a battery fault! The BMS could well be the route of a lot of owners problems... 
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20th Feb 2019 8:38am
