1997 E36 328i Convertible - won't start after new battery

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  1. 1997 E36 328i Convertible - won't start after new battery 
    #1
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    matias's Car Details
    Model of Car:
    328i
    Year of Manufacture:
    1997
    Transmission Type:
    Automatic
    Car Body Type:
    convertible

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    Hi folks. I have a 97 328i convertible that was running fantastic until I forgot the radio on and drained the battery. I tried to jump start the car with cables with no luck. I decided to replace the battery but I keep getting the same results:
    all lights/bells go off when I put the key in the ignition and turn it but the engine won't even crank.
    I only have a flat bmw key (not sure if it has a chip inside but it was working before the old battery died).
    Any help would be greatly appreciated.
     
     

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    #2
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    Ronnie's Car Details
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    Check for power at the starter motor solenoid wire when the key is turned to the start position, that needs to be your first port of call.
     
     

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    #3
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    matias's Car Details
    Model of Car:
    328i
    Year of Manufacture:
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    Car Body Type:
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    Thanks for the reply. I'll check that. but before i just found something something very interesting....not matter what gear (D, 1, 2, 3) I put the car in (it's automatic), i can push the car as if it was in Neutral.....is this normal?
     
     

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    #4
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    thepurpleblob's Car Details
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    If the car isn't running the auto box cannot engage a gear so it *is* in neutral.

    Jump starting a car is often a bit dodgy. I would check fuses and fusable links. Also, try disconnecting the battery again, wait several minutes and try again. Try to be decisive about connecting the terminal - it's not unknown to hang up a control box by "double clicking".

    I don't think the key being discharged will matter. The immobiliser chip doesn't need any power from the key battery.
     
     

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    #5
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    matias's Car Details
    Model of Car:
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    Year of Manufacture:
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    Car Body Type:
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    Thanks for the reply thepurpleblob. I would like to clarify that the problem was the car's battery, not the key one that was drained. The key I have, looks like a regular car key (no buttons, lights and doesn't look like it has a battery inside). That leads me to think that this is either a duplicate or the car original spare key.
    Since the car was running fine with this key before I replaced the car's battery, I didn't think the problem was the key.

    I will try unplugging the battery, leaving it disconnected for a few minutes and trying again. I noticed a fuse right next to the battery in the trunk (fuse is good) and all other fuses in the engine compartment seem to be ok.
     
     

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    #6
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    billywhizz1984's Car Details
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    Full battery power & lights but no crank sounds like immobiliser. Try locking & unlocking the drivers door with the key as this gives the immobiliser the "double lock & unlock" signal.
     
     

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    #7
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    matias's Car Details
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    thank you. would it be the same if I do it on the passenger's side door? the lock on the driver's side is broken and it just spins.....
     
     

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    #8
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    malc1111's Car Details
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    328i sport
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    Could always be a faulty new battery , you never know. Strange you could not jump start it, so sounds like immobiliser or similar as Billy says.
     
     

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