Battery Drain - MEMS3 Main Relay Fix?

Our 2004 45 suffers from a flat battery if left for more than a day because the main relay in the under-bonnet fusebox is being left energised by the ECM (engine control module or computer), which I think leaves the ignition energised. It draws about 0.35 amps with the ignition key removed.



According to other threads this is down to a blown FET (solid-state relay) in the MEMS3 ECM. The main relay can be reset by cycling power to the computer and the battery drain then stops.



An online company has quoted £195 + VAT to fix the ECM and that seems too high a cost compared to the value of the car.



It should be possible to rig up a switch to flick the power to the ECM off and on to reset the relay - has anyone done it successfully?



Or has anyone managed to fix the ECM themselves by replacing the FET, and if so which bit needs to be changed?



Presumably if the ECM is replaced by a second hand one, the matching alarm module and key fobs need to used too?

from the last news http://ift.tt/1C1lSOI

via IFTTT