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#1
08-24-2009, 07:36 PM
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After Jumpstart, Onboard CPU & Gauges Dead
After a jump start, the car seemed to be alright (it ran fine, and could be restarted). Except the on-board computer would not work, the gas gauge would not work, and the RPM gauge would not work. The only gauges that do work are the speedometer and the water temp. The on-board computer (display that shows the MPG/timer/distance to empty, etc.) is totally blank, and won't come back on, regardless of what buttons I press. I haven't tried much besides searching the forums, and I didn't find anything exactly like this. One post suggested disconnecting the battery for 15 minutes (similar problem) but I wanted to reach out to the community first. Should I just take the car to the dealer? Should I try the battery disconnect method? Other thoughts? Thanks! 
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#3
08-24-2009, 10:24 PM
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Quote:
At this point, it seems like the best bet is just to take it in. 
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#4
08-24-2009, 11:27 PM
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When the voltage goes low, the electronics can do some weird things. I agree taht doing a battery disconnect may be all it needs (fingers crossed) as it will do a full power reset on all the modules and may get them all working properly again. If that doesn't work then bring it in. (thinking you likely checked fuses already)
__________________
"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
08-25-2009, 04:08 PM
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I lost my central locking (remote, etc) after a jumpstart. Fortunately it was under CPO warranty took in and they fixed.
The Relay was fried I guess after the jump. -bdf
__________________
Previous: 2002 X5 3.0 / 121,000 miles Current: 2007 X5 3.0si / 93,000 miles
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#8
10-25-2009, 01:24 PM
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Bump... What did the dealer say? Mine has recently suffered this same problem after my brother borrowed it and left the lights on. After he jump started it, the outside temp is stuck, and the LED display has some of the pixels lit all the time.
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#9
10-26-2009, 07:57 AM
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almost the same thing happened to me. I left the stereo on while cleaning/detailing the car and totally forgot about it until and hour later. I had road assistant jump started the car and many weird things happened. At first, the car was fine but a day after I have Check Engine light and the transmission acted strangely. I brought the car back to the dealer; it turn out that the jump start fried my alternator and battery and throw the transmission in safe mode. I never realize that jump starting the car could cause such issues. I guess that I won't be having the radio on the next time I detail the car. Thank god for warranty.
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#10
10-26-2009, 10:02 AM
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It was suggested to me that with all the modern electronics on any newer BMW avoid jump starting if possible (use of a trickle charger, for instance). It was presented that there could be a surge when the jumper cables are removed and strange electronic problems have been noted even after a week or two of a jump start.
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