Thanks Brimfull for that. Just a quick question the unit I have is version 3970 what firmware would I need to sort out these issues?
It's not firmware that's the issue with battery drain, it's the part number of your canbus module. Late 2007 and onwards had modules that can cope with rns510, early modules dont switch the unit off fully when you remove the key from the ignition, which leads to the unit draining your battery.
The only ways to find out what module you have is to either fit the rns510 and then leave the car unused for 48 hours and see it if starts or remove your canbus module and check the part number on it.
There is a thread in here which lists all the rns510 friendly canbus modules by part number.
I have 2006 leon and had the battery issue so I had to upgrade the module from a 2010 model to solve the issue.
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