I have a 2002 X5 and have been having off-and-on problems for a very long time with the battery being drained after even a day of not driving. The battery is new, replaced it twice so I do not think it is the problem. When it won't start the Hill Descent light flashes rapidly and there is a loud clicking noise from the fuse box in the trunk which i haven't figured out exactly where that is coming from. When I then turn the key off and then back on again the the Red and Yellow (top two) lights next to the TEL switch flash rapidly. I appreciate any help anyone can provide. Thanks!