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Originally Posted by pm_wizard
Sorry to dredge this up from the past. I left my X5 4.8is parked in front of our house for 3 days while I was away. When I came home again the battery was completely dead. I would start with a boost, but the message screen says "engine failsafe mode"
I have taken it to the dealer today, and they just called to say essentially that they couldn't find anything wrong except the battery needed a charge (duhh!). I have told them I will be truly annoyed if it has to be boosted again, but they claim there is nothing wrong with the battery or the charging system.
This whole process started a couple of weeks ago when the bluetooth wouldn't work, followed a week later by the remote not working (key needed), and then this. If I hadn't made the appointment two weeka ago I would be stewing around without a vehicle!
Has anyone run into this? And was there a final resolution?
Thanks,
John
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John, if they have deep charged the battery and the charging system checks out OK, then some faulty module is draining the battery. Follow attached thread to find a few diagnostic procedures from Morristown BMW. I tried as instructed and found there was nothing wrong with my car, sleep mode was working fine. You'll need a fluke multimeter and a couple of hours of time - if you find that your X will not enter "sleep" mode, then you need to start pulling fuses to zero in on what circuit is causing the problems. Also, just for ha-ha's, disconnect your cell phone charger when not in use even though it switches off with the key - it's worth a shot! Anyway, good luck and hope this helps pinpoint your problem! 
http://www.xoutpost.com/x5-e53-forum/...ery-drain.html
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2022 X6///M - Toronto Red, Silverstone Full Merino Leather, Executive Package w/Remote Engine Start, Soft-close doors, Heated & Cooled Cupholders, Front Ventilated Seats, Front & Rear Heated Seats, Front Massaging Seats, Carbon Fiber Trim.
2002 X5 3.0i, Sport Premium, Titanium Silver, Grey Dakota, Cold Weather Pkg, Xenons, DICE, LED Tails, just a winter vehicle...
2007 550i, Sport Premium, Silver Grey Metallic, Grey Dakota, Nav, Cold Weather Pkg, Comfort Access, HD Radio, Xenons.
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