1996 E36 328ic battery wrong way around..help!?

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  1. 1996 E36 328ic battery wrong way around..help!? 
    #1
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    knaprigt's Car Details
    Model of Car:
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    Hey folks! I been readin through most of your postings here, and this seems to be the place to call out for some help!!!

    Last week i totally f*ucked up...
    I had been away for a cpl of days, i was in a hurry to get home, my battery was dead. Well by accident i had another battery in the trunk, a freetime one.
    Well long story short...i took the spare and replaced the batteries....what i DID NOT notice, was that the "connectors" was placed the other way on this battery...still no probs gettin the cables to fit. When i turned the key i noticed my dashboard beein nuts, and nothing would happen.
    I ainŽt really this stupid (even tho this felt like the most firsttimer-thing to do), so i immediately understood something was wrong with the battery and removed it.

    Well of course the charger was burnt...so that must be replaced.
    But other from that i got no idea, when i got the original battery back in the car, i tried starting it. Starter is working, but it wonŽt start...
    Since i donŽt have a diagnostic-tool myself, and i live in the outback...i wanted to try my luck here first, before toading it into town.

    You think i killed the DME? Even more stuff? No fuses at all got burnt.

    Honestly happy for any help! (and really, this ainŽt easy asking for, since i am actually a pretty decent DIY, but still accidents happen)

    Thanx in advance!
     
     

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    #2
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    adam031089's Car Details
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    i feel for u mate i did this with my old 200sx u feel like such a prat battery terminals round the wrong way is pretty serious i had to replace the alternator ecu and i burnt a substantial chunk of the wiring loom sorry mate
     
     

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    knaprigt (18-07-2010)

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    #3
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    ako89's Car Details
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    I doubt you'll fix it on your own tbh. If you lucky the wiring will be ok. You've probs killed the ECU.
    We've got a Pug 207 in at work, had the battery connected up the wrong way, killed the ECU and the BSI Unit.
     
     

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    knaprigt (18-07-2010)

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    #4
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    knaprigt's Car Details
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    Thanx for takin your time guys!
    Thing is i am pretty advanced myself (hard to believe after this incident i admit!), and i am surrounded by mechanics, but of course they canŽt do much about the car without a proper diagnostic-scanner.....so what the h*ll, i ordered one for myself last night, i figure this will give back the what it costs since i wont have to toad my car into town anymore.
    And i checked all wires, seems intact. Opened the DME (ECU) unit, nothing wrong what the eye could tell, but i guess the scanner will tell me if i am right or wrong about that.
    So iŽll wait for the scanner, will take about 2 days to get. I just hope it is as good as promised. If itŽs a hit, iŽll tell you all about it. Since ~270 Euros is kind of ok if it will just do all the tricks the manufacturer promised it would.
    Again, thanx for takin your time! And if someone still got some ideas, pls feel free to share!
     
     

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    #5
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    Ok..so now i got my scanner, and it is working fine. BUT, it wont connect with the DME/ ECU, it finds Airbags, abs...but not the DME....wonŽt connect....
    Was wondering if it might be possible the problem is infront of the unit...or if it is the unit itself....no idea...iŽll try to figure it out, any ideas?
     
     

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    jjbbuzz's Car Details
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    i can imagine ya blown a fare few fuses?
    [/SIGPIC][/SIGPIC]
    LET THE BRIDGES I BURN BEHIND ME, LIGHT MY WAY FORWARD....!
     
     

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    knaprigt (26-07-2010)

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    There will probably be a protection diode in the ECU. If it gets the voltage the wrong way round, it'll burn out the diode and save the ECU.
     
     

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    knaprigt (26-07-2010)

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    #8
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    Thanx guys! IŽll look into that!
    I was thinking in those directions myself, but i canŽt find any fuses especially infront of the ECU, i been looking trough the wiring-diagram, and it seems there are not any fuses...hard to believe... But diodes i would imagine...
    IŽd say i am quite a good mechanic...but when it comes to electricity i totally suck...too abstract for me i guess...but i really buy the diode-theory...iŽll just have to open up the ECU again...still i think i would need a diagram..but maybe one of my electrician-friends would know what to do...
    Back to fuses...i gone trough all the ones in the fuse-box under the hood, checked them with a pen, none burnt at all.... and what i can tell from wiring diagrams, there are no other fuses apart from those...?

    I totally appreciate all your help!
    Thanx again guys, and pls keep the good tips coming!
     
     

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    #9
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    shamM3's Car Details
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    Checked your DME relay?
     
     

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    knaprigt (27-07-2010)

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    This more often than not results in fairly serious damage sorry to hear and i hope you get it fixed
     
     

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    knaprigt (27-07-2010)

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