08 550i wont start without a jump

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08-11-2012, 12:19 PM

#11

tbanks

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My Ride: 550i 08

OK
o dont know what i did but the car starts up but when i turn it off it wont tunn back on unless i disconnect the - negative battery terminal several times and then it starts up
I dont get it

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08-12-2012, 10:07 AM

#12

BimmerFan52

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Quote:

Originally Posted by tbanks

OK
o dont know what i did but the car starts up but when i turn it off it wont tunn back on unless i disconnect the - negative battery terminal several times and then it starts up
I dont get it

Sounds like IBS.
Disconnect (remove two wire connector - you don't need to remove the IBS) and try starting again.

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08-15-2012, 02:32 AM

#13

tbanks

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My Ride: 550i 08

I disconected the IBS and same problem

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08-15-2012, 05:04 AM

#14

545felix

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My Ride: 05 545/6

Quote:

Originally Posted by tbanks

OOOOKKKKAAAYY
found the problem
the alternator was bad and i replaced it and the POSITIVE cable somehow blew apart inside the red housing!!! i sqeeezed it back together and viola the car starts up and charges.... so now i may need a new positive cable
thanks for all your help
now i just have to figure out how to clear the crash data with airbag light but thats another thread
thanks again

you're going to need a new positive cable. the cable has an explosive charge to server the main battery cable in case of a crash, while leaving a small one for emergency related systems. squeezing it back together is not going to provide a reliable connection. it's also the only way you're going to clear the airbag light (assuming there isn't a problem with an airbag or a pretensioner as well.)