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#1
04-18-2009, 05:32 PM
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Flat Battery
Regards John X5 NZ 
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#2
04-18-2009, 05:40 PM
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1 amp draw for 30 minutes won't drain a battery... the vehicle rest current draw specs from BMW is after the vehicle sits for 16 minutes it should draw 0.038 amps or less. (38 miliamps) and the proper way to measure this is with a graphing oscilloscope and an inductive low amp current probe that clips over the ground wire and reads inductively. The vehicle needs to be monitored over a long period of time usually to see if it wakes up overnight which is a pain to find as it usually only happens sporadically. (as you said, only happens every few months)
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#4
04-19-2009, 07:26 PM
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That sounds plausible, and most likely, but no removing the disc wouldn't help. What I would do is just unplug the power from the nav computer then recheck... odds are the nav itself may be the problem.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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#5
09-14-2009, 02:02 PM
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have you got this problem sorted out as i am have similar problems and just got back from auto electicians haveing solved nothing. It can go a few weeks then there is not enough power to start. A few weeks ago it did it after a 100 mile run parked up and the next morning it would not start.Surly it would have to be a massive drain tas it is also a new battery.
please help if you can
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#6
09-14-2009, 04:47 PM
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I had the same problem over a year ago with my 2001 4.4i - turned out to be the mobile phone. The Motorola V50 I have is not the original BMW one and does not have the necessary BMW firmware to properly shutdown when the ignition is turned off. This also prevents the NAV and possibly other accessories from powering off resulting in the gradual draining of the battery.
If you have a mobile phone fitted - try unplugging it every time you leave the car to see if the discharging problem stops. If it turns out that this is the problem - there are some outfits that can upgrade your phone to the BMW firmware. BMW ready phones are also usually available on eBay.
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Cheers, Brian ========================================= 2001 X5 4.4i Sport Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass. Too Cool for Jack Bauer 
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#7
09-14-2009, 06:25 PM
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Hi guys
I'm also having similar problems.. armed with this info I'm seeing my machanic Thursday and will tell him to check what you guys have mentioned... Will let you know outcome.. Have had it already checked over a few months ago and do have a very small drain but nothing that would give the trouble I'm having.. Many thanks Tony
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